 | | Journal (article/letter/editorial) | | COLORADO AMETHYST THOMAS C . MICHALSKI U. S. Geological Survey Denver Federal Center Denver, Colorado...E CENTURY, COL O R A D O ' S N U M E R O U S amethyst localities have been studied and recorded in geologic...that Colorado has any significant amethyst occur rences. Most of Colorado's " o l d " amethyst localities...fine gemstone and mineral specimens. Background Amethyst, the purple variety of crystalline quartz, has...beauty and sup posed mystical powers. The word amethyst comes from the ancient Greek and means "not drunken |  | | Journal (article/letter/editorial) | | Although Colorado may be most noted for rhodochrosite or amazonite, the many varieties and associations...a k e w o o d , Colorado 80225 DIANNE L. K I L E 333 S a l e m Street Aurora, Colorado 80011 C O L O...and J. A. Mur phy for an update to Minerals of Colorado: A 100-Year Record (Eckel, 1961). 374 ROCKS... Quartz was a familiar gemstone to many early Colorado residents, as documented by an extensive body...body of literature. The first published list of Colorado mineral localities (in cluding quartz) was included |  | | Journal (article/letter/editorial) | | afalster@mainemineralmuseum.org Muzo-habit Quartz Zigras Mine, Garland County, Arkansas Q uartz, the best known of minerals...theme, Crystals and Crystal Forms, we have selected Muzo-habit quartz from the Zigras mine at Blue Springs...Springs, Garland County, Arkansas, for this issue’s Connoisseur’s Choice. Silica, SiO2, is polymorphous; alpha-quartz...trigonal crystal system (or rhombohedral subsystem of the hexagonal crystal system). This crystal class...crystal’s habit—its overall shape—depends on which crystal forms are present and the relative degree of their |  | | Journal (article/letter/editorial) | | Museum of Nature and Science 2001 Colorado Boulevard Denver, Colorado 80205-5798 jmurphy @ dmns.org PETER...Survey MS 150, Box 25046 Federal Center Denver, Colorado 80225-0046 pmodresk @ usgs.gov Unless otherwise...to 2000) J oin us for a gemstone tour around Colorado! Our field trip takes us from east to west in...in the same way you may have toured through Colorado on a mineral collecting trip. This route, from the...gemstones are known to occur. We cannot discuss every Colorado gemstone occurrence; rather, this is a general |  | | Report (issue) | | 978-0-9836323-2-0 Publisher Lithographie, Ltd. Denver, Colorado, USA Design and Layout Gloria A. Staebler © 2012...Lithographic, Ltd. PO Box 11613 • Denver, CO 80211 • USA Phone: 1.303.495.5521 • Fax: 1.303.482.1238 W\\w...of America PHOTO CREDITS Cover: Quartz variety amethyst, 10.5 cm tall Goboboseb Mountains, Erongo Region...collection, Jeff Scovil photo Title (facing) Page Amethyst mouse with gold tail, 130 grams, 6.3 cm wide Carved...Brazilian amethyst Private collection, Robert Weldon photo © 2009 GIA Page 2 Quartz variety amethyst, 3.5 |  | | Book | | MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Sine —_—< ¢ te om At _SHT 40...MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Richard Walker Holmes and Marrianna...Mines and minerals of the Great American Rift (Colorado-New Mexico). Bibliography: p. Includes index...index. 1. Mines and mineral resources—Colorado. 2. Mines and mineral resources—New Mexico. I. Kennedy, Marrianna...enter must be obtained to prevent trespass. Old mine workings are dangerous and entering underground |  | | Book (volume) | | ...........................................59 Colorado ...............................................................548 Table of Maps Page Alabama County Map ...................................................................................4 Alaska County and Stream Map ..................................Co. Mining Districts ............................................................22 Arizona County Map.........................23 Arizona – Cochise Co. Mining Districts .................................... |  | | 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...well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a bed deposit⎯yellow...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...well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a bed deposit⎯yellow...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |  | | Journal (issue) | | - - - - - - - - - - - Mineral Collections 1n Colorado A Supplement to The Mineralogical Record November-December..."Smithsonian packet," Smoky Hawk claim, Florissant, Colorado. Collected in 2008; Dorris Family collection;...certificates for mines in the Cripple Creek District, Colorado, in 1898 and 1901. Sponsorship: This special...Collecting in Colorado The Collections: Mel & Pam Bersch Ryan Bowling Ralph Clark Colorado School of Mines...Kile Brian Kosnar Bryan & Kathryn Lees Ian Merkel Mining Hall of Farne, Steve Whittington curator Nick North |  | | Book (edition) | | describes sites under of the nearest town and county. and the many maps included book contain such...test samples in the field for color, hardness, crystal formation, transparency, and other distinguishing...Diamond M Tourmaline ^P Ruby. Sapphire O Quartz crystal ^J^ Garnet __ Azurite, Malachite, Chrysocolla...Turquoise LJ Emerald, Beryl ^"^ Agate ** Jade Amethyst nq -* % Gem Hunter's Guide Gem Hunter...in rock and being the first to see a sparkling crystal fresh from nature's hand. And the gem hunter gains |  | | Book (volume) | | SOUTHWESTERN QUADRANT Arizona, Arkansas, California, Colorado, Louisiana, Nevada, New Mexico, Oklahoma, Texas...Search of a Whale Wild Season Incident at Hawk’s Hill Wilderness Empire Johnny Logan The Wilderness...Southwestern Quadrant Arizoni, Arkansas, California, Colorado, Louisicna, Nevada, New Mexico, Oklahoma, Texas...eae ta - slactiy ten * ate cal —_ |™ ae Hea» La A. CONTENTS Volume 4A How to Use This Book ...Location Numbers Arizona Arkansas California Colorado 258 Louis B30 ana HOW TO USE THIS BOOK |  | | Report (volume) | | Radioactivity in the Metal-Mining Districts of the San Juan Mountains Colorado GEOLOGICAL SURVEY --*_-...Radioactivity in the Metal-Mining Districts of the San Juan Mountains Colorado By C. T. PIERSON, W. F. WEEKS...radioactivity in the metal-mining districts of the San Juan Mountains, Colorado, by C. T. Pierson, W. F..._______________ CeboUa district..______________________________ Upper Uncompahgre district. ______ _________________________...Uranium occurrences___________ ________ __ Bonanza district..____________________ ___________________ General |  | Doe, B. R., Steven, T. A., Delevaux, M. H., Stacey, J. S., Lipman, P. W., Fisher, F. S. (1979) Genesis of ore deposits in the San Juan volcanic field, southwestern Colorado; lead isotope evidence. Economic Geology, 74 (1) 1-26 doi:10.2113/gsecongeo.74.1.1 | Journal (article/letter/editorial) | | Depositsin the SanJuanVolcanicField, Southwestern Colorado LeadIsotopeEvidence B. R. DOE,T. A. STEVEN,M....other deposits (Summitville, Jasper, Red Mountain district) have values of 2ø•Pb/•ø4Pbsimilar to those of...have lead isotopiccompositions that are portant mining districts. Studies of lead in the as- more radiogenicthan...Antonito COLORADO NEW MEXICO L 0 100 KILOMETERS Fro. 1. Index map of southxvestern Colorado, showing...applied specificallyto the ores in the Creede district by Bethke et al. (1973) and by Stevenand Eaton |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state... test samples in the field for/ hardness, crystal formation," (continued on back flap) r 1° *o...M Tourmaline fQl Ruby, O Sapphire Quartz crystal 'y^ Garnet — Azu rite, Malachite, Chrysocolla... LJ Emerald, Beryl *"» Agate ** Jade =p Amethyst ^ X ) y ' £f h % ^ K Gem Hunter's ...Maryland; Professor Richard Pearl of Colorado Springs, Colorado; and Professor Jack Hanahan of Belmont |  | | Book (volume) | | be estimated from the pale rectangular step cut amethyst (left, upper group) which measures about 25 mm...(25.56 ct), Sweet Home Mine, Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...events to bring the history of North American gem mining up to date. Here, then, is the latest, most complete...and interviews with persons actively engaged in mining gemstones. Pertinent references are furnished throughout |  | | Book | | HfiRIN COUNTY FREE LIBRfiRY 311110G386652Q I V Russell P MacFal A COLOR TREASUF FOR COLLECTORS...it a veritable not just a picof informa- is mine tion, telling everything the collector needs to...gems and the science of crystallography— the six crystal systems and their characteristics. The actual tests...to Hunting Locations ? i 9 GIVEN TO THE MARIN COUNTY LIBRARY BY MARI N L MTNF.RAT. SOCTETY DAVID...Formations Compact and Special Forms Druses and Crystal Amorphous Forms VII 4 PHASES OF ROCK COLLECTING |  | | Book | | vugs of crystalline talc. Easily the best extant crystal, a doubly terminated floater found in a talc vug...long (Marty, 2004 ). AFRICA widely in Litchfield County, where good crystals were taken from quartz veins...region (Brunet, I 977b ). NEW YORK Amity, Orange County. At many isolated collected sites between the towns...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...Litchfield County. Ilmenite masses and crystals from somewhere near Washington, Litchfield County, were described |  | | Journal (article/letter/editorial) | | collecting. Although Texas is not known for its mining industry, be cause of its large oil and gas exploration...rare-earth pegmatite was mined at Barringer Hill in Llano County in the early 1900s but was flooded by Lake...1938. The Terlingua mining district is noted for its rare mercury minerals. Mining here was contin uous...from 1900 to the middle 1940s; but the Mariposa mine, which produced most of the rare minerals, ceased...& Minerals on "The Weeks Pegmatite Mine, Wakefield, Carroll County, New Hampshire" (March/April 1991) |  | | Book (volume) | | ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE...nodules⎯Pyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide exposures of blue clay...HIGHLAND COUNTY SINKING SPRING, area ore deposit (most important in Ohio) ⎯Hematite. HOCKING COUNTY AREA |  | | Book (volume) | | ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE...nodules⎯Pyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide exposures of blue clay...HIGHLAND COUNTY SINKING SPRING, area ore deposit (most important in Ohio) ⎯Hematite. HOCKING COUNTY AREA | | | Book (volume) | | be estimated from the pale rectangular step cut amethyst (left, upper group) which measures about 25 mm...rhoColorado; eolorless scheelite (19.66 cc), Kern Cowny, California;...Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...and interviews with persons actively engaged in mining gemstones. Pertinent references are furnished throughout... most likely in Canada. Systematic large-scale mining of sapphire-bearing gravels in Montana is beginning | | | Book | | not just a picture book. Rather, it is a veritable mine of information, telling everything the collector...and the science o f crystall ography- the six crystal systems and thei r characteristics. The actual...Format,ons Compact and Special Forms Druses and Crystal Amorphous Forms VII PHASES OF ROCK COLLECTING...SYMMETRY OF CRYSTALS 88 Nature of a Crystal I Th e Six Crystal Systems I Characteristic of the Systems...These are needed to spltt layers of rock remove crystal cavities from cliffs and tnm specimens to the desired |  | | Report (volume) | | it helpful to refer to Survey Bulletin 507, "The mining districts of the western United States," and to...abundant, it may have been completely exhausted by mining or quarrying. Deposits of minerals of wide distribution...because they occur in sufficient quantity to warrant mining for their usual products but because they furnish...A. F. Rogers, Stanford University, Palo Alto. Colorado.........Prof. R. D. George, Boulder. Connecticut...North Carolina.. .Dr. Joseph Hyde Pratt, Chapel Hill. North Dakota... .Dr. A. G. Leonard, Grand Forks |  | | Journal (article/letter/editorial) | | marble quarries at Sylacauga, Talladega, Co., Ala. COLORADO—"After a period of many years, the old Augusta...with vesuvianite, magnetite and calcite. "Th's mine goes back to the 1870's and 80's—and worked off...usually was only for short periods of activity that mining was done. ARIZONA—Masses of native copper, some...pounds, have been found in the Copper Queen Copper mine in Bisbee, Cochise Co., Ariz. ARKANSAS—A large,...Crestmore, Riverside Co., Calif. 462 "The ores of the mine are of interest to collectors for their bright colors—a |
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Crystal Hill Mine, La Garita, Crystal Hill Mining District, Saguache County, Colorado, USA