 | | Journal (article/letter/editorial) | | Two Point claim, Pikes Peak batholith, Teller County. The Collector’s Edge specimen, Jeff Scovil photo...Mail Stop 150, Box 25046 Federal Center Denver, Colorado 80225 pmodreski@usgs.gov C olorado is, of course...been written as guides to mineral collecting in Colorado. A classic, which went through three major editions...1951 version with a slightly different title), is Colorado Gem Trails and Mineral Guide, by Pearl (1951,...up-to-date guidebook to the state’s minerals is Colorado Rockhounding, by Voynick (1994). Other published |  | | Journal (article/letter/editorial) | | SOME MINERAL OCCURRENCES IN THE GUFFEY REGION, COLORADO* Jeuos E. Bnven, []niversity of Michigan, Ann...north-central Fremont County and southeast Park County in the Front Range of central Colorado. Its center is...associatedmigmatite. Cord.ierite:Sterrett (1923) recognized cordierite in the Climax pegmatite, which is one of the...pp. 43-45) and Heinrich (1950) discussed the cordierite occurrencein detail, including its extensive...origin of pegmatitic cordierite. Large boulders and several outcrops of cordierite-sillmanite gneiss were |  | | Journal (article/letter/editorial) | | pegmatite prospecting on Mount Antero, Chaffee County, Colorado, gives a detailed account of fine min eral-specimen...TYPES OF BERYLLIUM DEPOSITS AND OCCUR RENCES IN COLORADO AND SOME EXAMPLES I . Deuteric-magmalic. Beryl-bearing...EightMile Park (e.g., Mica Lode) and Devils Hole, Fremont County; Crystal Mountain, Larimer County. B. Phenacite...Larimer County, • D. Gadolinite. Zoned pegmatites. South Platte district, Jef ferson County; Cotopaxi...Fremont County. E. Gethelvite. Miarolitic Pikes Peak pegmatites. Cookstove Mountain, El Paso County. F. Bertrandite |  | | Journal (article/letter/editorial) | | stones) with smoky quartz on matrix, Mount Antero, Colorado. Denver Museum of Nature and Science specimen...Rhodochrosite on sulfides, Sweet Home mine, Alma, Park County, Colorado, Martin Zinn specimen, Jeff Scovil photo...November/December: Copper, Cliff mine, Keweenaw County, Michigan. A. E. Seaman Mineral Museum specimen...New Mexico, 301 Agate, Colorado, 233, 252-68; Michigan, 387 Aikinite, Colorado, 165 Alabandite, Virginia...Virginia, 324 Altaite, Colorado, 165 Ammonite, Colorado, 225-26 Amethyst, Colorado, 223,233-35 Amphiboles |  | Collins, Donley S., Cobban, Robert R., Foord, Eugene E., Murphy, Jack A. (1989) Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part A - Paper copy --Bibliography data file disks. Open-File Report Vol. 1989 (89-206) US Geological Survey doi:10.3133/ofr89206a | Report (issue) | | Survey Denver, Colorado Department of Geology, Denver Museum of Natural History Denver, Colorado NOTE FOR...revision of U.S.G.S. Bulletin 1114, Minerals of Colorado A 100 year record, by Edwin B. Eckel By Donley...Prepared in cooperation with Friends of Mineralogy - Colorado Chaptar, and the Denver Museum of Natural History...references dealing with the mineralogy of the state of Colorado. It is part of a more than 10 year effort to update...and revise U.S.G.S. Bulletin 1114, Minerals of Colorado: A 100 year record, by Edwin B. Eckel (1961). |  | | Journal (article/letter/editorial) | | SCHEELITE IN THE PRECAMBRIAN OGDEN GNEISSES OF COLORADO TWETO CONTENTS PAGE Abstract ................Precambrian age has been found at several localities in Colorado and Wyoming in recent years. Most of it is disseminatedin...Geological Survey. SCHEELITE IN GNEISSES OF COLORADO I NTRODUCTIO 1407 N ß SCaEEL•TEwas discoveredin...occurrenceat many localitiesin the Precambrianterranesof Colorado and part of Wyoming, show that during the Precambrian...non-graniticportion of the exposedPrecambrianterranesof Colorado,and othersare knownin Wyoming. Severalof the depositshave |  | | Report (issue) | | Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER...Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado By C. C. HAWLEY and R. A. WOBUS...OF THE SOUTHERN TARRYALL REGION, PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL...rocks, Park and Jefferson Counties. (Geology and ore deposits of the southern Tarryall region, Park and...and Jefferson Counties, Colorado) (Geological Survey Professional Paper 608-B) Bibliography: p. Includes |  | | 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) | | "Yellowstone National Park of Northwestern Wyoming." should read Yellowstone Park of northwestern Wroming............................................... Cordierite ................................................................... He)J's Ha1f·Acre, Natrona County .................................................Volcanic conglomerates in the Absaroka Mountains. Park County_ Sandstone_................................Petrified tree trunk, near Frontier Creek, Fremont County...................... Gneiss.................. |  | | Report (volume) | | Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |  | | Report (issue) | | Metamorphism of Some High-Grade Cordierite Gneisses, Front Range, Colorado Dolores J. Gable U.S. Geological...SOCIETY OF AMERICA, INC. Colorado Building P.O. Box 1719 Boulder, Colorado 80302 Printed in the United.............. . Distribution and occurrence of cordierite .............................................................. . Stratigraphic relations of cordierite-bearing gneiss .................. .............chemical composition of cordierite-bearing gneisses ................... . Cordierite-bearing biotite gneiss |  | | Journal (article/letter/editorial) | | that the principal rocks underlying Gilpin County, Colorado, and adjacent parts of Clear Creek and Boulder...Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado," U.S. Geol. Surv...Cottonwood-American Fork mining region of Utah, southwest of Park City, consists mainly of shallow-water deposits...Brick district of GunnisonCounty, Colorado,include mica, cordierite-mica, garnet, amphibole, quartz, granitic...states that granite is the pre-Cambrianrock of Luna County, New Mexico. Darton4 reports that the pre-Cambrianrocks |  | | Journal (article/letter/editorial) | | Childs Mielenz, Bureau of Reclamation, Denver, Colorado Werner Nowacki, Universitiit, Bern, Switzerland...Nevada. PETROLOGY OF THE GIIFFEY-MICANITE RXGION, COLORADO university ^iiff-'"l; lll'i.l.., "t Michigan...southeast part of Park County and in the north-central part of Fremont County, Colorado, is underlain chiefly...Fe-Mn phosphates, magnetite, bismutite, beyerite, cordierite-pinite, sillimanite, monazite, and uranothorite...SYEMTES AND NEPHELINE SYENITES OF STETTIN, MARATIION COUNTY, WISCONSIN ELAINE GEISSE Smith College, Northampton |  | | Report (issue) | | carbonate replacement ores of the Drum Mountains, Juab County, Utah, by T. S. Levering, J. H. McCarthy, and Irving...Thortveitite associated with fluorite, Ravalli County, Mont., by R. L. Parker and R. G. Havens __-____-__-____...fluorine in mineralized tuff, Spor Mountain, Juab County, Utah, by W. R. Griffitts and L. F. Rader, Jr....Dawson County, Ga., by J. W. Stewart---___-_---_---_----_-------------_----------10. Cordierite-bearing...in Precambrian rocks, Central City quadrangl -, Colorado, by P. K. Sims and D. J. Gable...._______..___ |  | | Book | | Al-silicate and quartz from the melt. The lack of cordierite, the occurrence of ferrogedrite (a possible metastable...amphibole-bearing assemblage, it is most likely metastable. Cordierite and almandine were not products of staurolite...breakdown in the Wehr xenolith. The absence of cordierite may reflect pressure conditions of c. 0.34 GPa...lithium pegmatites in the White Picacho district, AZ, USA, by London and Burt (1982). Fracture-controlled pseudomorphic...throughout the district. The Minerva No. 1 mine, Hardin County, Illinois, located in the NW 1/4 of the SE 1/2 |  | | Journal (article/letter/editorial) | | of COLORADO ED RAINES Geology Museum Colorado School of Mines 1310 Maple Street Golden, Colorado 80401...Ouray County. Raines-Pettem collection, photographer unknown. B etween 1868 and 1922, Colorado produced...with another 50 million pounds mined in San Juan County (Henderson 1926). During the twentieth century...mined (Beaty, Landis, and Thompson 1990). Total Colorado production prior to 1958 reached 585 million pounds...copper; Colorado mined gold, silver, lead, and zinc. Nearly all of the copper produced in Colorado has been |  | | Catalog/List | | SO/4 OH magnification there arc small crystals County, Arizona -------------"'--------'-'--'----'--____;;...grey cleavable massive Crystal peak, Park County, Colorado, USA Keystone, South Dakota U.S.A. 1" £4...grained mass in calcite Dark Star Mine,Ravalli County, Ix½ £2.50 lxl £4 ANCYLITECe CeSr CO/3 Montana...lx2 £2 mixture with Chrysotile, pale grey-green County Bridge Quarry,Lizard ,Cornwall MgFeSiO massive...Lincoln lxl £2 lx2£4 Pb (Cu Fe Al) SO/4 matrix, County, Nevada, U.S.A Unusual hollow pinkish pebble with |  | | Report (volume) | | the Gardiner Area Park County Montana Geology of the Gardiner Area Park County Montana By GEORGE D:...near the North Entrance of Yellowstone National Park, with special emphasis on recurrent faulting along...Quartzite ___________________ --------------------Park City Formation______________________________________...___ 31 88 GEOLOGY OF THE GARDINER AREA, PARK COUNTY, MONTANA By GEORGE D. FRAsER, HENRY A. ...in .southwestern Park Oounty, Mont., at the North Entrance to Yellowstone National Park. The Gardiner area |  | | Journal (article/letter/editorial) | | MICHAEL J. GOBLA 19055 East Bethany Place Aurora, Colorado 80013 gobla@copper.net Unless otherwise noted...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University...mines at Butte in Silver Bow County and the Black Pine mine in Granite County have produced many fine crystal...collector, Crystal Park in Beaverhead County, the pegmatites of Jefferson County, and the Snowbird mine...mine in Mineral County continue to be productive sources of mineral specimens. The Montana Gold Rush After |  | | Book (edition) | | a mineral was discovered (benitoite, San Benito County, California), or dedicated to a scholar (dolomite...from the Keweenaw measuring Peninsula (Lake USA) where masses weighing up to 400 metric tons and...Arizona (USA) and in the manganese skarns of Langban (Sweden) and Franklin, New Jersey (USA). Dendrites...(Australia) and Redbeds, Colorado (USA). The largest blocks are from Aspen, Colorado balt, (USA), where one weighing...electronics because of its very high conductivity. In the USA and some other countries it is still used as currency |  | | Catalog/List | | Fairfield County, Branchville White xlline with cymatolite, good study ... New Mexico Taos County, near Dixon...cerium aluminum silicate California Los Angeles County, Pacoima Canyon Large black tabular crystals in...iron silicate ACTINOLITE California San Bernardino County, Wrightwood Green prismatic crystalline mass ....CROSSITE Sodium iron silicate California San Benito County, Gem mine Compact blue-gray mass with natrolite...sodium potassium alumino-silicate Arizona Final County, Christmas Dark green cleavages in andesite .. |  | | | | world-renowned gem and mineral collection at Los Angeles County Museum of Natural History since 1980. Joan Kaylor...Oxygen reacts with the iron in rocks to pro- Colorado Plateau in Arizona, home WEATHERING Rocks formed...hike to see, such as Half Dome in Yosemite National Park, Telltale Signs he first clue to the identity of...fossils. Those shown here were uncovered in Franklin County, Indiana, in sedimentary rock formed some 440 million...in the The Grand Canyon was probably when the Colorado River cut jh sedimentary sequence where the fossil |  | | Report (issue) | | GEOLOGICAL SURVEY Locatable Mineral Reports for Colorado, South Dakota, and Wyoming provided to the U.S.............................................. 1 COLORADO ................................................San Isabel and White River National Forests Lake County Land Exchange Offer (Iocmin40) .................................. 138 FIGURES OR ATTACHMENTS COLORADO Pike National Forests Shepard and Associates Land.......8 3. Geologic map of the area near Woodland Park (Bryant and others, 1981, scale 1:250,000) .... |  | | Book (volume) | | 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...Cantlin, Ellis, [D; Jeannette B. Carillo, Gem Center USA, EI Paso, TX; Gary Christopher, The Prospectors Cache...James D. Lindberg, Las Cruces, NM; Jack Lowell, Colorado Gem & Mineral Co., Tempe, AZ; Steven & Lorna Lukinuk...Resources, Vancouver, BC; Barbara L. Muntyan, Ouray County Historical Society, Ouray, CO; Merrill O. Murphy |  | | Report (issue) | | the major product (as at Climax and Henderson, Colorado, and Questa, New Mexico), or is a co- or byproduct...XVT XVA XWA XWI XWY ALASKA ARIZONA CALIFORNIA COLORADO GEORGIA IDAHO MAINE MISSOURI MONTANA NEVADA NEW...of the Pine Grove-B la*n Mountain area. Beaver County, Utah: U. S. Geological Survey Open-File Report...molybdenum system, southern wah wah Mountains, Beaver County, Utah (abstract): American Institute of Mining...deposits of the Mount Antero region, Chaffee County, Colorado: U.S. Geological Survey Bulletin 982-D, p |
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