61. Maine Geology - Mineral Collecting Hundreds of people explore the state each year in search of crystals, Many examples of Maine minerals are on exhibit at the Maine Geological Survey and http://www.state.me.us/doc/nrimc/pubedinf/factsht/economic/mincolec.htm

Skip Maine state header navigation Agencies Online Services Web Policies ... Help State Search: MAINE DEPARTMENT OF CONSERVATION Maine Geological Survey Mineral Collecting Maine has an excellent reputation among "rockhounds" for the variety and quality of mineral specimens found within its borders. Hundreds of people explore the state each year in search of crystals, semiprecious gems, gold, and other minerals. The novice is practically assured of finding something of interest at Maine's collecting sites, while a large assortment of rare minerals await the advanced collector. Mineral collecting is an inexpensive hobby that can be enjoyed by all age groups, and offers the fringe benefits of outdoor recreation and the opportunity to learn about earth science. Many of the best minerals in Maine are found in an igneous rock called "pegmatite", which is a very coarse-grained granite. Some pegmatites are enriched in uncommon minerals such as beryl, topaz, and colored tourmaline; they may also contain very rare species or large crystals of various minerals. Pegmatite veins are abundant in parts of Oxford, Androscoggin, and Sagadahoc Counties. Most of them were commercially worked for mica or feldspar, creating piles of waste rock ("dumps") where collectors search for specimens. Road cuts and natural outcrops of other rock types occasionally provide good mineral specimens. This is particularly true of coarse-grained metamorphic rocks produced by the deep burial and recrystallization of ancient marine sediments. Examples of metamorphic mineral occurrences include the kyanite and staurolite crystals in mica schist at Windham, garnet crystals in schist and calcium-rich rocks at numerous places, and vesuvianite crystals in Sanford.

62. Bixbyite, Rutile, And Amethyst Crystals Near Marysvale - Utah Geological Survey The Utah Geological Survey investigates and reports on Utah s geologic hazards, for by the excellent crystal forms of these relatively rare minerals. http://geology.utah.gov/utahgeo/rockmineral/collecting/rkhd0598.htm

ugs utah geology / marysvale minerals Bixbyite, Rutile, and Amethyst Crystals near Marysvale, Piute County by Stanley C. Hatfield Geologic information: The Marysvale area is dominated by Tertiary igneous rocks ranging from intermediate to silicic compositions with both volcanic and plutonic representatives. The especially thick volcanic section is thought to be the result of a large stratovolcano complex and associated calderas that existed during mid-Tertiary time. One of the common units found near Marysvale is a white to dark gray rhyolite with extremely well-developed flow banding. The crystals, which are found in cavities in the rhyolite, formed in gas pockets that were trapped in the lava flow as it cooled. Bixbyite, a rare iron-manganese oxide, occurs as black, metallic, euhedral crystals up to 3/8 of an inch across. The crystals are generally complex combinations of various isometric forms including cubes, octahedrons, and dodecahedrons. Rutile is less common and appears as needle-like or bladed crystals up to 1/4 inch long.

63. Smokey Quartz & Feldspar Crystals - Utah Geological Survey ugs / utah geology / rocks minerals / smokey quartz feldspar. Smokey Quartz and Feldspar crystals at Rock Corral Canyon in the Mineral Mountains, http://geology.utah.gov/utahgeo/rockmineral/collecting/quartz.htm

ugs utah geology Smokey Quartz and Feldspar Crystals at Rock Corral Canyon in the Mineral Mountains, Beaver County by Dustin L. Rooks Smoky quartz and microcline crystals from the Rock Corral area collected by the author in November of 1996. Quarter in foreground for scale. Geologic information: The Mineral Mountains, located in Beaver County, make up the largest exposed plutonic body in Utah. Rock compositions range from quartz monzonite in the northern half of the pluton to granite around Rock Corral Canyon in the south. Excellent crystals of smoky quartz and feldspar are found in vugs or cavities in the granite. They formed when cooling fractures in the granite were filled by late-stage pegmatites consisting of quartz, microcline, and plagioclase. Quartz occurs as clear to smoky, euhedral crystals up to three inches long while microcline is commonly found as euhedral, equidimensional crystals averaging approximately 0.75 inches in width. Occasionally, large pseudomorphs of limonite after pyrite can be found in these areas as well. How to get there: Travel 0.7 miles south of the railroad tracks on State Route 21 from Milford where a Corral Recreation Area sign will instruct you to turn left (east) from the highway. This road is paved for a short distance but then turns to sand. Continue from the turn-off 5.4 miles to an intersection. Take the left fork and continue for 1.2 miles to another intersection. Keep right at this intersection for 2.7 miles to the first outcrop or inselberg on the left. You can park here or continue to the picnic area in Rock Corral Canyon.

64. Mesa State Geology Courses Introduction to minerals, rocks, geologic time scale and basic geologic terms, Laboratory identification of minerals and crystals by spectroscope, http://www.mesastate.edu/snsm/geology/academics/degindx/course.htm

Course Descriptions GEOL 100 Survey of Earth Science (3) Physical makeup of the earth, its history, and geology. One field trip is required. Intended for students with majors other than one of the sciences. (Fall/Spring) GEOL 103 Weather and Climate (3) Non-mathematical introduction to elements of local and global weather: the atmosphere, cloud formation, precipitation, seasons, optical phenomena and violent storms. Students practice making 24-hour weather forecasts. (Fall/Spring) GEOL 104 Oceanography (3) Non-mathematical introduction to the scientific study of the ocean. While the course focuses on the hydrosphere subsystem of the Earth System, the atmosphere, cryosphere, lithosphere and biosphere interrelationship with hydrosphere are also examined. (Spring) GEOL 105 Geology of Colorado (3) Introduction to minerals, rocks, geologic time scale and basic geologic terms, followed by geology of Colorado taught with the aid of slides and overheads. A one-day field trip is required. (Fall/Spring) GEOL 107 Natural Hazards and Environmental Geology (3) Introduction to geologic aspects of our environment. Includes studies of natural hazards, global climate change, geologic resources and emphasizes human interactions with the environment. (Spring)

65. IC Minerals, The Mineral Collectors Place IC minerals is devoted to the sale of fine minerals and crystals for those interested For mineral collecting, mineralogy, geology or the earth sciences http://www.icminerals.com/

IC MINERALS An internet store providing fine minerals for the collector. Established in 1989 and online since 1998. Rhodochrosite - N' Chwaning, SA Pyromorphite Les Farges, France Andradite on Hematite N' Chwaning, SA Cuprian Adamite - Tsumeb, Namibia Currently featuring: Minerals from the Martin Zinn Collection Sept. 1, 2005 MINERAL GALLERIES ABOUT COMPANY WHAT'S NEW TESTIMONIALS the Holiday Inn at 4849 Bannock Street, Room 102 (Sept. 13 to 18)... Or in Houston at the Gem and Mineral Show at the Humble Civic Center at 8233 Will CLayton Parkway (Sept. 23 to 25) All major credit cards and Paypal accepted. Contact IC Minerals at: PO Box 1376 Goldenrod, FL 32733-1376 USA e mail: icminerals@earthlink.net IC Minerals is devoted to the sale of fine minerals and crystals for those interested in mineral collecting, mineralogy, crystallography, rockhounding, rocks, geology or the earth sciences. I carry an array of minerals from classic and contemporary mining localities, stocking a wide selection of minerals from Africa, Europe, Asia, North and South America. The philosophy is simple, to offer fine minerals to the collector, in all price ranges for all budgets, from Thumbnail to Museum size, from the more common species to rarities, and from reference to Museum display quality specimens. In other words, I am sure that I can accommodate most hobbyists, from the systematic collector to the pursuer of aesthetic excellence, as well as those collectors who specialize in localities, certain species, crystal habits, chemical classes, twinning or pseudomorphs. No matter what your taste or what you collect, there's a good chance IC Minerals will have it. In my 15th year in business, I offer quality, stand by my specimens and have many satisfied repeat customers.

66. Awesome Library - Science Earth Science and geology Lessons Grade 11 (British Columbia Ministry of Education minerals, crystals, and Gems (Natural History Museum of Los Angeles http://www.awesomelibrary.org/Classroom/Science/Earth_Sciences/Earth_Sciences.ht

Search Spelling Here: Home Classroom Science > Earth Sciences Earth Sciences Sub-Topics Earthquakes and Plate Tectonics Glaciers Hurricanes Lakes ... The Weather Also Try Ancient History Dinosaurs and Fossils Geography Paleontology Discussions Ask the Earth Scientist Lesson Plans Earth Forces - Grade 10 (British Columbia Ministry of Education) Provides a lesson plan for the 10th grade level. The materials are called an Integrated Resource Package. 2-01 Earth Science and Geology Lessons - Grade 11 (British Columbia Ministry of Education) Provides lessons on Earth and Its Environment (Introduction), Geological Science (Earth Materials), (Weathering and Erosion), (Tectonics and Vulcanism), (Tectonics and Earthquakes), (Resources and Environment), Oceanographic Science (Oceans), Atmospheric Science (The Atmosphere), (Pressure and Winds), (Evaporation, Precipitation, and Weather), and Earth's History (Geologic Time). For the 11th grade level. The materials are called an Integrated Resource Package. 2-01 Earth Science and Geology Lessons - Grade 12 (British Columbia Ministry of Education) Provides lessons on Earth Materials (Introduction to Geology), (Minerals), (Igneous Rocks and Processes), (Sedimentary Rocks and Processes), (Metamorphic Rocks and Processes), (Mineral, Rock, and Energy Resources), Time and the Fossil Record (Relative Dating), (Absolute Dating), (Geologic Time Scale), (The Fossil Record), Internal Processes and Structures (Plate Tectonics), (Seismology), (Isostasy), (Earth's Interior), and (Structural Geology), Surficial Processes (Weathering and Erosion), (Running Water), (Glaciers), and (Ground Water). For the 12th grade level. The materials are called an Integrated Resource Package. 2-01

67. Rocks And Minerals - MMSD Electronic Library minerals, crystals, and Gems SteppingStones to Inquiry This web site for minerals (from UW Madison geology Museum) This site features pictures and http://www.madison.k12.wi.us/elib/elib.cgi?cat=156;o=alpha

68. Geology Of The McLaughlin Deposit The variety of minerals found at the McLaughlin mine is well known and extensive. The crystals in this pocket were exceptionally coarse. http://nrs.ucdavis.edu/mclaughlin/naturalhis/region/region4.htm

Homestake Mining Company McLaughlin Mine Geology of the McLaughlin Deposit By Dean Enderlin, Geology of the McLaughlin Deposit continued . . . Page 4 of 5 Minerals of McLaughlin The variety of minerals found at the McLaughlin mine is well known and extensive. A small sampling is presented below. Lemon Opal A form of common opal (no fire), this opal was found at the surface in only one spot in the McLaughlin deposit. The deep yellow pigment was due to hydrocarbon impurities (probably curtisite), which also made the lemon opal fluoresce under UV light. D. Enderlin photo. Precious Opal In spite of the abundance of opal throughout the McLaughlin deposit, only one small pocket of precious opal was ever found. The samples at right display green and orange fire. N. Lehrman photo. Mercury and Cinnabar Cinnabar is the red sulfide of mercury. The image at left shows the liquid metal (mercury or quicksilver) with a piece of cinnabar from the old Gail Pit. Cinnabar was widespread in the shallow portions of the deposit, but was rarely seen as the pit was deepened. D. Enderlin photo.

69. Geology 221a - Mineralogy Schedule Of Topics - Fall 2000 Th 07 in the context of geology, chemical classification of minerals, Tu 12 Sept, Crystallography constancy of interfacial angles, minerals are crystals http://www.science.smith.edu/departments/Geology/Min_jb/Schedule00.html

Geology 221a - Mineralogy Schedule of Topics - Fall 2000 Th 07 Sept Introduction: course organization, mineralogy in the context of geology, chemical classification of minerals, physical properties of minerals. Tu 12 Sept Crystallography: constancy of interfacial angles, minerals are crystals constructed from patterns, coordinate systems for minerals: lattices, unit cells, directional indices, Miller indices. Th 14 Sept Crystallography: symmetry operations, symmetry elements (rotation, reflection, and their combinations), crystal systems, crystal classes, Neumann's principle. Tu 19 Sept Optical mineralogy: electromagnetic waves, refractive index, Snell's Law, critical angle. Th 21 Sept Optical mineralogy: measurement of refractive indices, Becke lines, oblique illumination, dispersion. Adirondack Field Trip 22-24 September Tu 26 Sept Optical mineralogy: polarization of light, double refraction, ordinary and extraordinary rays, wave normals, ray paths, vibration directions, Snell's Law revisited. Th 28 Sept Optical mineralogy: Birefringence, addition and subtraction of interference colors, conoscopic observation of uniaxial crystals, isogyres, isochromes, optic sign.

70. Remote Sensing Tutorial Page 2-1a The Six Fundamental Concepts about the Earth s geology lightcolored and large feldspar and quartz (minerals) crystals, and Basalt - extrude as lavas on http://rst.gsfc.nasa.gov/Sect2/Sect2_1a.html

SOME BASIC CONCEPTS UNDERLYING THE SCIENCE OF GEOLOGY GEOLOGY - THE SCIENCE OF THE SOLID EARTH AND ITS INTERNAL PROCESSES, INFLUENCED ALSO BY THE ATMOSPHERE, OCEANS/RIVERS, AND BIOLOGICAL ACTIVITIES - COMES FROM THE GREEK WORDS GEOS (EARTH) AND LOGOS (STUDY). PLANETOLOGY INVOLVES ON-SITE AND SENSOR INVESTIGATIONS OF THE OTHER SOLAR (AND NOW EXTRASOLAR) PLANETARY BODIES, USING MAINLY COMPARISONS TO TERRESTRIAL GEOLOGICAL FEATURES AND PROCESSES AND APPLYING METHODS OF ANALYSIS PROVEN EFFECTIVE FOR EARTH STUDIES. The Six Fundamental Concepts about the Earth's Geology 1. The Earth formed about 4.6 billion years ago, along with the other solar planets and the Sun itself. The planets built up by accretion of rocky and gaseous debris (asteroidal, planetesimal [meteoritic] materials and comets) through collision of orbiting bodies. Aided by gravitational attraction, early on the assembling Earth underwent partial to complete melting, separation of different materials into an inner and outer core (iron-nickel), and extensive interior mantle, (iron/magnesium/calcium-rich silicates), and a thin crust (enriched in silica, sodium/potassium/aluminum), all (except the outer core) solidifying by cooling over the first few hundred million years; escaping gases produced an atmosphere (H, CO , N, CH ) were held above the solid Earth by gravity owing to its large mass; in time (about 4 billion years ago), the Earth's exterior cooled sufficiently to allow vast volumes of water vapor to condense, forming in lower areas great concentrations of water collection into oceanic basins.

71. Mineralogical Record: Smithsonian's Janet Annenberg Hooker Hall Of Geology, Gems Smithsonian s Janet Annenberg Hooker Hall of geology, Gems and minerals, The The Many Faces of crystals, One Mineral/ Many Shapes (pyrite, then calcite, http://www.findarticles.com/p/articles/mi_qa3672/is_200005/ai_n8885795

@import url(/css/us/style1.css); @import url(/css/us/searchResult1.css); @import url(/css/us/articles.css); @import url(/css/us/artHome1.css); Home Advanced Search IN free articles only all articles this publication Automotive Sports FindArticles Mineralogical Record May/Jun 2000 Content provided in partnership with 10,000,000 articles Not found on any other search engine. Featured Titles for ASA News ASEE Prism Academe African American Review ... View all titles in this topic Hot New Articles by Topic Automotive Sports Top Articles Ever by Topic Automotive Sports Smithsonian's Janet Annenberg Hooker Hall of Geology, Gems and Minerals, The Mineralogical Record May/Jun 2000 by White, John S Save a personal copy of this article and quickly find it again with Furl.net. It's free! Save it. This quite new mineral and gem gallery (opened September 1997) merits many compliments. Before proceeding with those, however, an admission is in order, in the interests of full disclosure. The reader must be told that I have long been associated with the Smithsonian and was, in fact, curator-in-charge of its mineral and gem collections when I retired in 1991. All I can say against the possible charge of bias is that I have done my best to produce a review that is fair and balanced. In fact, it is not based solely upon my own reactions. I have purposely invited comments from numerous friends who have also critically assessed this gallery; most, but not all, of them are involved with minerals either professionally or as collectors. With the exception of a relatively minor number of specific criticisms, the overall reaction has been enthusiastically positive.

72. Geonote6_1 Describes how crystals, semiprecious stones, and precious metals form in nature, geology importance, erosion, mining, and the uses of minerals, metals, http://www.geology.enr.state.nc.us/proj_earth/Geonotes6asof03262001/Geonote6_1.h

Grade 1 Collecting Rocks USGS Information Services Box 25286, Denver, CO 80225 Fax: 303-202-4693, or call 1-888-ASK-USGS http://pubs.usgs.gov/gip/collect1/collectgip.html 11-page folded brochure on where to find rocks, types of rocks, collecting equipment, handling a collection, and helpful geological hints. Grade 1—2.02 FREE Common Ground: Modern Mining and You (Loan) Modern Talking Picture Service 5000 Park St, N., St. Petersburg, FL 33709 This 26-minute VHS video examines the role of mining in our society and discusses how important it is to our quality of life. Loaned free; request No. 26028 Grade 1—2.02 Common Ground: Modern Mining and You P.O. Box 625002, Littleton, CO 80162-5002 This 26-minute VHS video examines the role of mining in our society and discusses how important it is to our quality of life. Grade 1—2.02 Crystal and Gem ( Eyewitness Books Dorling Kindersley Publishing 95 Madison Ave., New York, NY 10016 http://www.dk.com/ Describes how crystals, semiprecious stones, and precious metals form in nature, how crystals are grown artificially, and how crystals are used in industry. Grade 1—2.01, 2.02 $19.00

73. AnyWho: Internet Directory Assistance; Yellow Pages, White Pages, Toll-Free Numb Science/Earth Sciences/geology/Rocks and minerals/Rock and Mineral Localities (22) Book distributor of books on gems, rockhounding, crystals, mineral http://www.anywho.com/cgi-bin/webdrill?catkey=gwd/Top/Science/Earth_Sciences/Geo

74. Crystals, Minerals, Fossils, Meteorites, Rocks Hundreds of crystals, minerals, fossils from around the world, Hard to find books on the geologic, minerological, and metaphysical aspects of stones. http://www.bestcrystals.com/

11 years of business in 2005 CRYSTALS Quartz Crystal, Amethyst, Citrine, Rose Quartz, Smoky Quartz, Rutilated Quartz, Celestite, Herkimer Diamond, Apophyllite, Zeolite, Tourmaline, Danburite, Topaz, Kyanite, Zincite, Calcite, Selenite, Emerald, Garnet, Aquamarine, Diopside, Epidote, Kunzite, Ruby, Ruby-Zoisite, Apatite, Tanzanite, Peridot, and more. MINERALS Agate, Amazonite, Amber, Chrysoprase, Fluorite, Hematite, Howlite, Iron Pyrite, Jasper, Labradorite, Lepidolite, Malachite, Obsidian, Opal, Rhodonite, Sodalite, Tiger Eye, Unakite, Rhdochrosite, Aventurine, Jade, Lapis Lazuli, Chrysocolla, Azurite, Aragonite, Magnetite, Gold, Man-Made Minerals, and more. GEODES Geodes for kids to serious collectors. Cathedral Amethyst Geodes, Agate Geodes, Ocho Geodes, Break-your-own Geodes. SPHERES Over 30 varieties of polished spheres and eggs available. FOSSILS Trilobyte, Ammonite, Orthoceras, Amber, Fish and plant fossils, Woolly Mammoth Bone, Coprolite, and more. METEORITES A variety of Meteorites and meteoric impact material, from various locations. Moldavite, Tektite, Gibeon, and more.

75. Nearctica - Geology - Minerals And Gems - Crystallography Return to geology. Main Page Introduction to Crystallography and Mineral Crystal Systems. Mike Howard and Darcy Howard. A tremendous resource on the web http://www.nearctica.com/geology/mineral/crystal.htm

Minerals and Gems - Crystallography Special Segments Butterflies of North America Conifers of North America Eastern Birds List of N.A. Insects Home Eastern Wildflowers General Topics Natural History Ecology Family Environment Evolution Home Education Home Conservation Geophysics Paleontology Commercial Organizations Return to Geology Main Page Photo courtesy of John Betts Fine Minerals Books About Rocks and Minerals Crystallography is a very difficult science and most of what you will find on the web is very technical and of very little relevance to mineralogy. The study of crystal shape, form, and physics is relevant to materials science and molecular biology as well as the study of rocks and minerals. You need a special talent for three dimensional representations to do well in the subject. Introduction to Crystallography and Mineral Crystal Systems . Mike Howard and Darcy Howard. A tremendous resource on the web. This online publication is an extensive and very well illustrated introduction to crystallography. It examines the basic principles of symmetry, and goes through the various systems of crystals with all of their forms and variations. Highly recommended. Crystallography 101 . Bernhard Rupp. This site in an online, interactive introduction to the science of crystallography and is very technical. Most mineralogists will find it little applicable to their needs even though it is a great site.

76. Mineral Identification Exercise A Virtual Tour of the Gems, minerals and geology Display. Interactive Learn about crystal structures by viewing an interactive movie. halite picture http://geology.csupomona.edu/alert/mineral/minerals.htm

Learn about Igneous Rocks. Learn about Metamorphic Rocks. Go to Cal-Poly's ALERT HomePage. Grow Crystals At Home A fun experiment for home or the classroom. Learn About California's Mining Legacy Visit the U.S. Borax Mining Museum at Boron, CA. Learn about the borax mining and the "20 Mule Teams" A fun days outing. Collect Salt Crystals Two days a year the world famous Searles Lake collecting site is open to the public. The collecting is fantastic and there are activities for the entire family. W EB SITES Mineral Galley A very comprehensive index and database of minerals and mineral occurrences. Perhaps the best on the Web. Los Angles County Museum of Natural History A nice gallery of many of the more interesting minerals on display at the museum. A good site to visit before a trip to the museum Smithsonian Janet Annenberg Hooker Gallery A Virtual Tour of the Gems, Minerals and Geology Display. Still under construction. I NTERESTING BOOKS Klein, Cornelius, 1998; Manual of Mineralogy , The definitive reference book on minerals. Not for the beginner, but a must for every serious rockhound. Pough, Frederick, 1998;

77. GLY 220 Physical Geology Notes GLY 220 Physical geology, Paul Howell, University of Kentucky. Physical Properties of minerals Crystal form - geometry of freely-grown mineral. http://www.uky.edu/AS/Geology/howell/220/notes03-minerals-spring2005.html

GLY 220 - Physical Geology, Paul Howell, University of Kentucky. Notes 3 Minerals Read Chapter 5! Here are some key concepts (terms) to study for lecture: Rock, Mineral, Element, Atom, Proton, Neutron, Electron, Nucleus, Energy Level Shell, Ion, Isotopes, Compounds, Bonding (covalent, ionic, metallic, van der waals) Crystals, Polymorphism, Ionic substitution, Elemental abundances. Mineral families: #1 Silicates, what is a silica tetrahedron ? how do they bond? how many different ways? why is this mineral family so darn important? Other families: Carbonate, Halide, Sulfide, Oxide, Sulfate, Phosphate, Hydroxide, Elemental... Silicate Family Groups: know the different groups of silicates and how their tetrahedrons are bonded. Know this! Here are some key concepts to study for lab: Mineral Properties (brief notes at the bottom of this page) Cleavage, fracture, luster, hardness, Mohs scale, color, crystal form, streak, density, taste, solubility in acid Rock = aggregate of minerals and/or mineraloids Mineral = naturally-occurring solid with a characteristic chemical composition and a crystalline structure.

78. Growing Crystals GROWING crystals. Matthew A. Beebe Department of geology This is probably a good point to display mineral crystals, if they are available, http://www.beloit.edu/~SEPM/Rocks_and_minerals/growing_crystals.html

GROWING CRYSTALS Matthew A. Beebe Department of Geology College of William and Mary Williamsburg, VA 23185 Level: Upper elementary to junior high (part one may be suitable for lower levels) Anticipated Learning Outcomes Students will understand the processes of dissolution and crystallization. Students will observe different crystal forms. Students will understand that crystal size is a function of rate of crystal growth. Background Minerals are crystalline. Crystalline structures are characterized by an ordered internal arrangement of atoms or molecules. The external shape of a mineral may or may not reflect this ordered structure. If a mineral is in the form of a crystal its external form reflects its internal structure. Quartz is commonly found as crystals and as fractured pieces that do not have a crystal form. It is not necessary for students to understand the concept of what atoms and molecules are, but they should understand the concept of ordered structure. An analogy of stacking blocks (or some other object) in a regular pattern is useful to explain ordered structure. Rocks are composed of mineral grains. Some sedimentary rocks contain, or are composed completely of, minerals that crystallize from concentrated seawater. These include rock gypsum and rock salt (halite). Igneous rocks are those that solidify from molten material. Grain (crystal) size in igneous rocks is controlled by rate of cooling. If a magma (molten material) cools slowly crystals will grow to a visible size resulting in the coarse-grained texture characteristic of such rocks as granite. If a magma cools quickly (at or near the surface of the earth) crystals will be quite small, resulting in the fine-grained texture of rocks such as basalt.

79. Mama's Minerals' Geology & Earth Science Ring Passes checker test Crystal World fossils, minerals, rocks, meteorites Site gives an extensive list of books about geology, Rocks, minerals, http://d.webring.com/go?ring=geoesring&id=13&next

80. Introduction To Minerals Two minerals with the same chemical composition, but a different crystal structure. Examples? Return to Outline Return to Physical geology GSAMS page http://www.gpc.edu/~pgore/geology/geo101/mineral.htm

Introduction to Minerals Pamela J. W. Gore Georgia Perimeter College Objectives 1. Distinguish between rocks and minerals. 2. Distinguish the three basic subatomic particles, understand atomic mass, atomic number, radioactivity, isotopes, and ions. 3. Describe the various type of bonding in chemical compounds (ionic, covalent, metallic). 4. Describe the process of crystallization in minerals. 5. Distinguish the physical properties that are useful in identifying minerals. 6. List the eight most common elements of the earth's crust. 7. Briefly describe the silicon-oxygen tetrahedron. 8. List and distinguish among the common silicate minerals. 9. List the economic uses of some common minerals. 10. Describe the chemical classification of minerals. Outline Definitions Physical Properties of Minerals Chemical Properties of Minerals Basics of Chemistry ... Silicate Structures Definitions Mineral Naturally occurring Inorganic Solid Definite chemical composition Orderly internal crystal structure Examples?

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