 | | Journal (article/letter/editorial) | | WITHIN THE ALBITE-EPIDOTE HORNFELS FACIES. FREMONT COUNTY. cor6nnoo CuRnrBs A. Salorrr, The Uniaersi...quartzalbite metasedimentary rocks in western Fremont County, Colorado. The metamorphic grade of these albitic...River between Howard and Cotopaxi in southcentral Colorado,discloseda well-exposedisolated Precambrian albiticquartzose...Quartz-albite-andalusite-cordierite-epidote group-mica Quartz-albite-almandite-cordierite * epidote group-mica...Quartz-albite-mica schist with knots of accessory andalusite, cordierite, epidote minerals and randomly distributed zircon |  | | Journal (article/letter/editorial) | | 1, 15-52. NOTE ON LARGE CORDIERITE PORPHYROBLASTS, FREMONT COUNTY, COLORADO Russnrr, B, Tnavrs,* Colorad...Colorad.oSchoolof Mines, Goklen, Colorad.o. Cordierite occurs abundantly and, in places, conspicuously in...in metamorphic rocks of the Front Range, colorado. rt is most readily detected as porphyroblasts, although...hornfelses; for example, cordierite-anthophyllite rocks, a few miles north of Salida, Colorado. The purpose of...east of Texas Creek, on U. S. Highway 50 in Fremont County. At this point, a contact between Precambrian |  | | Journal (article/letter/editorial) | | 1965 MINERALOGY AND PARAGENESIS OF THE COTOPAXI, COLORADO, Ct-Zn SKARN DEPOSIT Cuenr.BsA. Sar-orrr,Departmentof...base-metal deposits crops out in south-central Colorado. At Cotopaxi mineralization is confined to a small...INrnonucrroN Nearly all metallic mineralization in Colorado is associatedwith igneous rocks and structures...but little-studied ore deposits in south-central Colorado is Precambrian in age. These deposits (Fig. 1)...Included among thesedepositsare the following: Chaffee County Cleora district prospects (Fig. 1, No. 2) Sedaliamine |  | | Journal (article/letter/editorial) | | 1, 15-52. NOTE ON LARGE CORDIERITE PORPHYROBLASTS, FREMONT COUNTY, COLORADO Russnrr, B, Tnavrs,* Colorad...Colorad.oSchoolof Mines, Goklen, Colorad.o. Cordierite occurs abundantly and, in places, conspicuously in...in metamorphic rocks of the Front Range, colorado. rt is most readily detected as porphyroblasts, although...hornfelses; for example, cordierite-anthophyllite rocks, a few miles north of Salida, Colorado. The purpose of...east of Texas Creek, on U. S. Highway 50 in Fremont County. At this point, a contact between Precambrian |  | | 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) | | 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 |  | | Journal (article/letter/editorial) | | METAMORPHOSED PROTEROZOIC BASE-METAL SULFIDE OCCURRENCES, COLORADO: A RE-EVALUATION OF GAHNITE COMPOSITION AS A GUIDE...metamorphosed to the amphibolite and granulite facies in Colorado, many of which are spatially associated with Mg-rich...tremolite, forsterite, cummingtonite, sapphirine, cordierite, enstatite, and clinohumite. The composition...massive-sulfide deposits in Mg-rich alteration zones in Colorado, causes a marked enrichment in the spinel component...guide, massive sulfides, magnesium enrichment, Colorado. SOMMAIRE Le spinelle zincifère [(Zn,Fe,Mg)Al2O4] |  | | Report (issue) | | Geology of the South Pass Area, Fremont County, Wyoming By RICHARD W. BAYLEY, PAUL DEAN PROCTOR,· and...geologic map of the Atlantic City district, Fremont County, Wyo -------------------Geologic map and cross...27 28 31 GEOLOGY OF THE SOUTH PASS AREA, FREMONT COUNTY, WYOMING By RICHARD W. BAYLEY, PAUL DEAN...the south end o;f the Wind R!i\ner Rang.e in Fremont County, Wyo. Laramide uplift and erosion exposed the...Mountain are of greenschist facies. Andalusite and cordierite schist is widespread. Sillimanite occurs only |  | | 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...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) | | THE CHIEF LITHIUM PEGMATITE, DEVILS HOLE, FREMONT COUNTY, COLORADO1 E. Wu. HnrNnrcu eNo Rrcnann W. VraN...) . and chemicals corporation in canon city, colorado. However, Iithium minerals were rumored to have...formation: hornblende gneiss' calc-silicate gneiss, cordierite gneiss, qttartzite and muscovitized nodular sillimanite...Geologic map of the Chief pegmatite' Devils Hole, Colorado' gradational contacts with wali-zone rock. In... oF THE RBcroN Lithium pegmatitesare rare in Colorado,indeed in the entire Rocky asMountain belt from |  | | 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...Mica Lode) and Devils Hole, Fremont County; Crystal Mountain, Larimer County. B. Phenacite. Mt. Antero...Larimer County, • D. Gadolinite. Zoned pegmatites. South Platte district, Jef ferson County; Cotopaxi...Cotopaxi, Fremont County. E. Gethelvite. Miarolitic Pikes Peak pegmatites. Cookstove Mountain, El Paso County |  | 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). |  | | Report (issue) | | ............................................ Cordierite ................................................................... He)J's Ha1f·Acre, Natrona County .................................................Petrified tree trunk, near Frontier Creek, Fremont County...................... Gneiss.................Geological Survey, Federal Center, Denver, 2S Colorado. Good topograph ic maps of various parts of Wyoming...Brontosaurus, were excavated near Sheep Creek in Albany County. The skeleton of this reptile. which is one of |  | | Journal (article/letter/editorial) | | CORDIERITE IN PEGMATITE NEAR MICANITE, COLORADO E. Wtu. Herwucn, UniversityoJ Michigan,Ann Arbor, Mi...the Micanite district in Colorado contains unusually large masses of cordierite, which is altered in varying...pegmatitic and vein cordierite are summarized, and the paragenesis of pegmatitic cordierite is discussed. ...Micanite pegmatite district iies acrossthe Park-Fremont County line in south-centralColorado, a few miies...1949, at which times some fresh and much altered cordierite was obtained. This collection was supplemented |  | Snyder, George L., Hausel, W. Dan, Klein, Terry L., Houston, Robert S., Graff, Paul J. (1989) Precambrian Rocks and Mineralization, Southern Wyoming Province - Hartville Uplift to Copper Mountain Area, Wyoming July 19-25, 1989. Field Trip Guidebook T332. American Geophysical Union | Report (issue) | | References cited 1U .S. Geological Survey, Denver, Colorado. ~e Geological Survey of Wyoming, Laramie, Wyoming...Ludwig of the U.S. Geological Survey, Denver, Colorado. Transportation has been arranged by Paul Graff...George Snyder, U.S. Geological Survey, Denver, Colorado. Lunches have been arranged by Steve Schilling...Schilling, U.S. Geological Survey, Denver, Colorado. We thank the following ranchers or local officials for their...Ludwig of the U.S. Geological Survey, Denver, Colorado. Transportation has been arranged by Paul Graff |  | | Journal (article/letter/editorial) | | area in the northeastern Wind River Mountains, Fremont County, Wyoming. The locality is 24 kilometers by...may have formed from retrogressivebreakdown of cordierite. However,no definitecordieritewas found in any...the Double Lake Area, Wind River Mountains, Fremont County, Wyoming SPINEL zs-l zs-r with with Biotite...relative to almandine and sillimanite, or to cordierite. The red-weathering zone, near which these spinels...the Double Lake Area, Wind Riuer Mountains, Fremont County,llyoming. M.S. Thesis, University of Washington |  | | Journal (article/letter/editorial) | | traskite, verplanckite and muirite from Fresno County, California Stinson, NI. C. and Matthews, R. A... Seven new barium miuerals from eastern Fresno County, Californier (abs.) 1.2+ 2r0+ 278 273 Stinson... Seven new barium minerals from eastern Fresno County, California AJlan, D. with Brown, V. (Book 314...alkalic rocks of the Arkansas River Area, Fremont Countyr Colorado. 2. Fetid gas from car1972 bonatite and...seven new, Barium (Hubbard) from eastern Fresno County, 2040 (Alfors, Aplite-pegmatites, composite, of |  | | Journal (article/letter/editorial) | | (about 19131, Esterbrook copper district, Albany County. John Taylor collection. An ideal and inexpensive...“The Copper Mountain Pegmatite District, Freniont County, Wyoming” and was in the JulylAugust 2001 issue...most notable ones. The localities are listed by county and then in alphabeticnl order. Where numerous...names are from Hausel (1986). Localities by County Albany County Allanite pegmatite, 12 miles W of Bosler...s, ColoradoWyoming State Line district, Albany County: largest crystal is approximately 0.Y carat. Karl |  | | Journal (article/letter/editorial) | | from the Devil's Head area southwest of Denver, Colorado, a few years ago. A large milky quartz crystal...Connecticut, and from the Mt. Antero region of Colorado. A very large smoky quartz crystal was recovered...Custer, South Dakota; near the Royal Gorge in Colorado, and elsewhere. Small crystals of rose quartz...Carolina; at Amelia, Virginia, near Clayton, Rabun county, Georgia; etc. The old localities near West Chester...at Shaw and Esray's quarry near Chester, Chester County, Pennsylvania, and is now in the collection of |  | | Journal (article/letter/editorial) | | A New Source of Gem-Quality Cordierite and Corundum in the Laramie Range of Southeastern Wyoming Downloaded...gem- and near-gem-quality cordierite and corundum (fig. 1). The cordierite is host ed by quartzofeldspathic...sapphires (1.15 and 1.47 carats) were faceted from cordierite and corundum from Palmer Canyon. Photo by Maha...occurrence is accessible by driving west from The cordierite and corundum occurrence is located in Wheatland...nearly 70 miles north by Vic Norris, from Lyons, Colorado, a few years after I made the discovery. Thus |  | | Journal (article/letter/editorial) | | quartz + chloritoid ± staurolite; 3) gedrite + cordierite + garnet + biotite + muscovite + plagioclase...+ quartz + ilmenite ± andalusite; 4) spinel + cordierite + biotite + muscovite + andal usite + plagioclase...the inner zone of the contact aureole is garnet-cordierite-biotite-andalusite-plagioclase-quartz. The Karatash...fault; 8) isograds of chloritoid, andalusite and cordierite, defining reaction zone; 9) sam pling point...most repre sentative samples. aureole by the cordierite isograd. Chlorite and chloritoid are unstable |  | | Journal (article/letter/editorial) | | Canyon, isotropic sound velocities usFremont County, Colorado. 3. 1001 ing refractiveindex data. . . The...sphene from Crystal Lode pegmatite, near Eagle, Colorado (Young, Munson). Arnold, R. G. Mixtures of hexagonal...(Book review). Cordierite, the polymorphism of, I: The crystal structure of low cordierite (Gibbs) Cossyrite...properties of calcic labradorite from Lake 177 County, Oregon 533 "tarrDankslte (lvlorgall ). Fang, J...836 INDEX TO VOLUME 51 cordierite I: The crystal structure oflow cordierite. . . 1068 Gilbert, M. C |  | | Journal (article/letter/editorial) | | 20059, USA Branch, Code 691, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA 3Faculty...rock 399 © Meteoritical Society, 2003. Printed in USA. 400 G. Kletetschka, T. Kohout, and P. J. Wasilewski...Aplite, Boulder County, Colorado 6.96 6 Quartz monzonite porphyry, Garfield, Colorado 8.79 7 Granodiorite...Rhyolite, Castle Rock, Colorado 7.3 12 Rhyolite porphyry, Chaffee County, Colorado 4.24 13 Hornblende syenite...syenite, Cripple Creek, Colorado 7.09 15 Trachyte porphyry (bostonite), Essex County, New York 8.52 16 Trachyte |  | | 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 |  | | Journal (article/letter/editorial) | | Allanite from the Mount Wheeler 'White area, Pine County, N e v a d a( L e e ,B a s t r o m ) . . . . ....Anthophyllite albiteepidote hornfels facies, Fremont County, Colorado (Salotti) Antigorite, ferroan (Jenkinsite)...barite deular and semi-random oneposit in Hot Spring County, layer structures.. 819 Arkansas (Lippmann) Ba...(Book review) Raotite (Pao-T'ou-K'uang)from Ravalii County, Montana Beryl, an unusual, from Arizona (Schaller...Baranova,E. N. . Aguachile Mountain, Barker, F. Cordierite-garnet at gneiss and associated microCoahuila |
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