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| subconchoidal to uneven fracture. Its luster on crystal faces is usually adamantine because of its high...the Martin prospect and Bennett quarry in Oxford County. Good crystals up to 25 mm have been found with...crystals up to 1 cm at the Gillette quarry, Middlesex County, Connecticut. Cassiterite as small crystalline...Conway Granite north of Moat Mountain, Carroll County, New Hampshire. Good cassiterite specimens, a few...been found in the well-known pegmatites of Amelia County and other Virginia localities. Large cassiterite |
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| December 2012 Flgun 1. View from the summit of Pika Peak looking northwest acro88 the cliff’s of Glen Cove...northeasterly-trending continentul Figure 2. Geologic map of the Colorado Front Range showing the Precambrian metamorphic...formbasin was established in the southeril Pikes Peak Batholith. Adapted by the author from Reed, Bickford...Karistrom 1978; Lanthier 1978). Farther south in Colorado, sediments accumulated in decper-water rocks formed...Survey into “Early, Middle, and Late” Eras. In Colorado we because of the subsequent folding and overthrusting |
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| Julius Weber Mamaroneck, New York COLORADO ISSUE #2 Articles Colorado locality index.............................. 323 by B. L. Muntyan What’s new in Colorado minerals? ......................................of Colorado ..................................349 by J. A. Murphy Amazonite from the Pikes Peak batholith...10 cm tall, from the Yucca Hill claim, Park County, Colorado. Richard A. Kosnar specimen; photo by John...invaluable reference which should provide us with crystal draw ings to illustrate articles for centuries |
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| Denver, Colorado, USA © 2011 by Lithographie, LLC P.O. Box 11613 • Denver, CO 80211 • USA Phone 1.303...Topaz ALFREDO PETROV & JOHN RAKOVAN 34. Colorful Colorado DAVID W. BUNK 42. Mongolian Topaz: The Gorkhi...and chromium can substitute for aluminum in the crystal structure. Ideal "fluortopaz" (Al2SiO4F2) would...lighter and larger than fluorine. Crystals and Crystal Structure Crystals are orthorhombic and are typically...dipyramidal with point group symmetry 2/m 2/m 2/m. Crystal structure consists of layers of oxygen, fluorine |
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| Three mine pegmatites, Ramona district, San Diego County, California ............................101 by...25046, M .S. 905 Denver Federal Center Denver, Colorado 80225 In recent decades the science of mineralogy...techniques which have been introduced and applied. Crystal structure determinations, which used to be difficult...textbook handy. A mineralogical example is that of crystal drawing. Several commercially available computer...computer programs (e.g., SHAPE) exist for generating crystal drawings from different' perspectives. While these |
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| EARTH’S TREASURES • MINERALS AND JEWELRY PIKES PEAK MINERALS A Museum Display R&G KIDS Fossil Sand...Collectors CAMEOS Ancient and Contemporary Carvings CRYSTAL SKULLS Modern Art or Genuine Artifacts? www.rockngem...STAINLESS STEEL CABBING UNIT This machine is made in the USA for Kingsley North. Features an all stainless steel...displays in the Pikes Peak Historical Society Museum, in Florissant, Colorado, include the area’s minerals...fluorite is from a claim near Crystal Park, Colorado, at the base of Pikes Peak. (Jeff Scovil photo/ Collector’s |
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| Both are carbon, but because of differences in crystal structure, graphite is one of the softest minerals...have the same chemical composition—carbon—their crystal structures are very different, as shown in the...have the same chemical composition but different crystal structures. (The aragonite specimen Czechoslovakia...quantities. Gems A gemstone can be either a single crystal of a mineral or an aggregate of minerals, including...8,000 feet at the top. Vigorous erosion by the Colorado River gouged out a deep gash, exposing spectacular |
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| ...........................................59 Colorado ...............................................................548 Table of Maps Page Alabama County Map ...................................................................................4 Alaska County and Stream Map ......................................................................22 Arizona County Map ................................................................................49 Arkansas County Map .......................................... |
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| information b Book review c Crystal morphology information d Crystal drawing ff Continues on following...193-256 137-208 129-192 209-264 193-256 [ [ COLORADO-Ill] 177-256 121-184 89-168 1-120 1-88 [ ...177-256 185-280 169-248 [ 425-528 337--400 COLORADO-II] 321--400 337--400 ARIZONA-Ill] 337--400...69-132 65-128 1-64 11 / 1980 20 I 1989 [ COLORADO-I] [ 289-352 385-448 [ AUSTRALlA] 353-504...Iaria from the Howard-Montgomery quarry, Howard County, Maryland (by J. S. White) 25:53-54 AFGHANISTAN |
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| Both are carbon, but because of differences in crystal structure, graphite is one of the softest minerals...the same chemical composition----carbon-their crystal structures are very different, as shown in the...have the same chemical composition but different crystal structures. (The aragonite specimen is from Czechoslovakia...quantities. ~ Gems A gemstone can be either a single crystal of a mineral or an aggregat~ of minerals, including...8,000 feet at the top. Vigorous erosion by the Colorado River gouged out a deep gash, exposing spectacular |
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| I. Jacobson, Denver, CO Anthony R. Kampf, l.A. County Museum of Natural History, CA Virgil W. Lueth,...across a local area net\,vork. Subscription offices: USA/North America: Taylor & Francis Group, LLC, 530 Walnut...Copyright Clearance Center (www.copyright.com) in the USA or the Copyright Licensing Agency (www. cla.co.uk)...Brazil: At the Natural History Museum of Los Angeles County, Carl A. Francis and Aaron Celestian 89 Who's...cm high, Himalaya mine, Mesa Grande, San Diego County, California; E: Tourmaline, 13.8 cm, Madagascar; |
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| cleavage fracture morphology luminescence remark crystal crystals In the figure captions, always mentioned...particular minerals, acsthctic criteria such as size of crystal and color played a role in addition to their importance...chemical data, including chemical formula and crystal system. The data provided correspond mainly to...copper are in the Keweenaw Peninsular. Lake Superior, USA, the largest being 15 x 7 x 3m (approx. 50 x 23 x...occurred in the Ray mine and in Bisbce, Arizona, USA. Very fine spincl-law twins up to 5 cm in size and |
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| This book provides a basic introduction to the crystal structure of minerals, as well as illustrations...crystals are considered to be a mineral called crystal structures. Natural crystals formed by geological...considered to be minerals. Microcline, Crystal Peak, Colorado, USA * 12 x 9x 5 om MINERALS: PRODUCTS OF...compositions and crystal structures. Each unique combination of elements and crystal structure is called...malachite produced this way keeps the original crystal shape of the azurite, it is called a pseudomorph |
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| ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |
 | | Book (volume) |
| ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |
 | | Book |
| formulae. General properties. Here the mineral’s crystal system—the basic arrangement of its atoms—is specified...ALLOYS Silver Ag Silver is a member of the cubic crystal system but crystals are rare, the mineral occurring...states of Guanajuato and Chihuahua, Mexico. In the USA silver occurs at Keweenaw, Michigan, in association...copper ores, and at Butte, Montana, as well as Colorado, Arizona and Idaho. In Canada it occurs at Cobalt...Above: Copper from Lake Superior. Michigan. This crystal shows the enlarged faces of the rhombic dodecahedron |
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| cleavage fracture 1norphology luminescence remark crystal crystals Jn the figure captions. the bigger dimension...particular ninerals, aesthetic criteria such as size of crystal 1.nd color played a role in addition to their mportance...che1nical data, including chemical formula md crystal system. The data provided correspond nainly to...copper are in the Keweenaw Peninsular, Lake Superior, USA, the largest being I 5 x 7 x 3m (approx. 50 x 23...occurred in the Ray mine and in Bisbee, Arizona, USA. Very fine spinel-law twins up to 5 cm in size and |
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| 85740. Website www.minrec.org Front Cover CINNABAR crystal, 2.1 cm, from the Dadongla (Yunchangping) mine...of painstaking “craftsmanship,” and aesthetic crystal groups were coming into being thanks to adroit...cinnabar truly was not glued on, a cute quartz crystal had perhaps been appended. After Chinese minerals...several hours in concentrated hydrochloric acid, the crystal faces have paid the price. And fluorite crystals...from the pyrite workings at Shangbao: impressive crystal groups of quartz and pyrite freed from enclosing |
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| Kobuk jade locality. Descriptions of San Diego County, California, gemstones and the mines in which they...the generous assistance of many residents of that county. My special thanks are extended to Elbert H. McMacken...Gemstones, Crystals, The Geometry of Crystals, Crystal Growth, Cleavage, Specific Gravity, Light upon...645 668 List of Illustrations . Six crystal systems . A crystal lattice . Refraction and reflection of...Murfreesboro diamond mine . A California diamond crystal . Seven corundum crystals . Map of Corundum Hill—Ellijay |
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| Menzies Pink topaz from the Thomas Range, Juab County, U ta h .........................................check out this new way of selecting purchases. Crystal Models Anyone who has ever tried to study crystallography...that the process is much easier if you have goo crystal models to play with. Rene Just Haiiy (1743-1822)...collectibles today. Among the more recent producers of crystal model sets was tl German mineralogist Paul Heinrich...Burchard has produced a book < computer-generated crystal drawings and supportive data relating the original |
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| Structure of Minerals 34 Symmetry of the External Crystal Forms 48 Physical Properties 112 Occurrence...to form three-dimensional crystal lattices. It does not matter if the crystal is a natural product or produced...ice or colorless and transparent quartz (rock crystal). This is the name that has been adopted for the...any edges or lustrous faces is still termed a crystal. Its internal structure remains unchanged by this...same crystalline structure as an immense quartz crystal weighing as much as a ton and completely bounded |
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| Geologic Interpretation of Colorado Scenery the Minerals and Rocks Colorado Gem Trails Mineral Collectors...America's Mountain: Pikes Peak and the Pikes Peak Region Nature Colorado Gem Trails and Mineral Guide...PEARL Department of Geology Colorado College, Colorado Springs, Colorado BONANZA BOOKS * NEW YORK...Service; Dr. Evan J. Scott, associated with and Colorado College; Eleanor Steiner; Bessie Vermillion; Verna...University of Colorado Reo N. Pickens, Jr., took the color photographs. Richard M. Pearl Colorado College |
 | | Book (edition) |
| the out- standing shows of the annual San Diego County Fair at Del Mar, California. In addition, the collections... Denver, Australia, MinMassa- California, Colorado, Gregory, Speci- Bottley England, and others...compound names - Major mineral classes CHAPTER 4 CRYSTAL GROWTH bi Crystals from melts, solutions and...crystals - Internal imperfections of crystals - Crystal and aggregate habits Twinning CHAPTER 5 GEOMETRY...of crystallography - Cell shapes and systems - Crystal axes - How faces are related to axes - Axial ratios |
 | | Catalog/List |
| huge museum inclusions, strange habits, and odd crystal growths. He searched specimens; and he called..............................................22 Colorado ................................................Silver District, Trigo Mts, La Paz Co., Arizona, USA “A cluster of red bladed wulfenites to about 2 cm...Trigo Mts, La Paz Co., Arizona, USA “A good bright red 4 cm crystal on matrix. Got the specimen when...Paz Co., Arizona, USA “Mostly a single well formed sharp shiny red wulfenite crystal growing out of a |
 | | Book (edition) |
| the use of polarizing plastic film for testing crystal fTagments introduces concepts of oplical mineralogy...the outstanding sho,vs of the annual San Diego County Fair at Del Mar, California. In addition, the collections...Angeles, California, E. l\lf. Gunnell, Denver, Colorado, Specin1en Minerals, Ltd., Woodville \Vest, South...compound names • Major mineral classes CHAPTER 4 CRYSTAL GROWTH 57 Crystals from melts, solutions and...crystals • Internal imperfections o f crystals • Crystal and aggregate habits • Twinning CHAPTER 5 GEOMETRY |
