 | | Report (issue) | | and rocks from the Sedalia mine area, Chaffee County, Colorado By Douglas M. Sheridan 1 , William H...about 4 miles north-northwest of Salida, Chaffee County, Colorado. Located in 1881, the mine produced about...deposits of base-metal sulfides and gahnite, Chaffee County, Colorado: U.S. Geological Survey Open-File Report...and rocks from the Sedalia mine area, Chaffee County, Colorado Sample number Description Locality...ROCKS (Map Unit g) S-13A-75............. .Garnet-cordierite-amphibole gneiss............................ |  | | Report (issue) | | deposits of base-metal sulfides and gahnite, Chaffee County, Colorado By Douglas M. Sheridan and William H...standards and stratigraphic nomenclature. Denver, Colorado CONTENTS Page Abstract........................quartz-mica schist....................... Garnet-cordierite-amphibole gneiss, garnetiferous quartz-mica schist...Geologic map of the Sedalia mine area, Chaffee County, Colorado.........................................Proterozoic sulfide deposits in the Salida area, Colorado.............................................. |  | | Journal (article/letter/editorial) | | Two Point claim, Pikes Peak batholith, Teller County. The Collectorâs 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 stateâs minerals is Colorado Rockhounding, by Voynick (1994). Other published |  | | Report (issue) | | Quadrangle, Chaffee County, Colorado GEOLOGICAL SURVEY Work done in cooperation with the Colorado State Mining...Deposits of the Poncha Springs SE Quadrangle, Chaffee County, Colorado By RALPH E. VAN ALSTINE GEOLOGICAL SURVEY...PROFESSIONAL PAPER 829 Work done in cooperation with the Colorado State Mining Industrial Development Board Description...Springs SE quadrangle, Colorado Page .In pocket Index map of south-central Colorado ______ __ ____ Photographs...quadrangle, Chaffee County Gravel pits in the Poncha Springs SE quadrangle, Chaffee County in GEOLOGY |  | | Journal (article/letter/editorial) | | pegmatite prospecting on Mount Antero, Chaffee County, Colorado, gives a detailed account of fine minÂ...TYPES OF BERYLLIUM DEPOSITS AND OCCUR RENCES IN COLORADO AND SOME EXAMPLES I . Deuteric-magmalic. Beryl-bearing...Lode) and Devils Hole, Fremont County; Crystal Mountain, Larimer County. B. Phenacite. Mt. Antero. C....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) | | 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] |  | | Journal (article/letter/editorial) | | Collins, Colorado 80521 PIDOTE from the Calumet Iron Mine in the Turret District, Salida, Colorado The Calumet...mineral localities in Colorado. Some of the best epidote ever discovered in Colorado has come from this...accessible through the town of Salida in Chaffee County, Colorado. It is located in the Turret district...by taking Colorado Route 291 north from Salida, Colorado. T u r n right onto Chaffee County Route 180...miles to a fork in the road. T u r n left onto County Road 190 and drive 1.6 miles to Railroad Gulch |  | | Report (volume) | | Zinc-Copper-Lead Sulfides and Zinc Spinel (Gahnite) in Colorado U,S. GEOLOGICAL SURVEY BULLETIN 1550 , Precambrian...Zinc-Copper-Lead Sulfides and Zinc Spinel (Gahnite) in Colorado By DOUGLAS M. SHERIDAN and WILLIAM H. RAYMOND...zinc-copper-lead sulfides and zinc spinel (gahnite) in Colorado. (Geological Survey bulletin ; 1550) Bibliography:...Geology, Stratigraphic-Precambrian. 3. Geology-Colorado. I. Raymond, William H. II. Title. III. Series...potential . . . . . . . . Deposits in other areas in Colorado Distribution and significance of gahnite Economic |  | | Catalog/List | | enlarged photograph of a piece of Obsidian, from Lake County, Oregon, which shows a Conchoidal fracture. t...iron, manganese and titanium) Bladed in quartz; Colorado ....... ................ .50 .60 .35 .75 ...vanadate) Rich mass; Colorado. About 40% ....... .1 x 2", .75 6.00 3.00 High grade; Colorado ... . .. ........x 2", .25 In sandstone, lean commercial grade; Colorado ...... 1.25 .75 . 35 Note : Carnotite is prohibited...COPPER-PYRIT ES-See Chalcopyrite COQUINA-See Calcite CORDIERITE (magnesium aluminum silicate) Blue masses, in |  | | Catalog/List | | Albemarle Counly, Virginia ... Custer County, Colorado . Albemarle County, Virginia . Near Mesaba, l\linnesola...York . San Juan County, Colorado Delta, Shasta County, California . Boulder County, Colorado .. .... Newlon... Massachusetts Mt. Shasta, California " Lyon County, Nevada Hillsborough, New Brnnswick Keeseville...York " " " .Near Keene, NC\\' York . Essex County, New York Rochester, New York Split Rock, Minnesota...Minnesota Iron Mountain, near Cripple Creek, Colorado -Sec also ¡orite, under Gabbro. Anthracite-sec Coal |  | | Report (issue) | | Deposits of the Poncha Springs NE Quadrangle, Chaffee County,Colorado By RALPH E. VAN ALSTINE With a section... PAPER 626 Prepared in cooperation with the Colorado State Mining Industrial Development Board UNITED...Ralph E. Van Alstine and Doak C. Cox _________ _ Colorado-American mine ______________ -_Delay adit and...Poncha Springs NE quadrangle. Geologic map of the Colorado-American fluorspar mine, Browns Canyon district...district. Geologic map of underground workings, Colorado-American fluorspar mine. Longitudinal section showing |  | 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) | | pegmatites in the Trout Creek Pass, Chaffee County, Colorado, USA, which are generally Ca,U,Th-depleted...emplaced in medium- to high-grade metamorphic rocks (cordierite migmatites, biotite-sillimanite gneisses) in...pyroxeneâphlogopite melasyenite (durbachite); d â sillimanite, cordierite-bearing biotite gneisses; e â granulites and...subtype pegmatites from the Trout Creek Pass, Colorado are quite homogeneous (Hanson et al., 1992). 6...pegmatites from the Trout Creek Pass, Chaffee County, Colorado, USA, are enclosed in the Denny Creek Granodiorite |  | | Catalog/List | | iron, manganese, and titanium) Bladed in quartz; Colorado ... .. ... . ... .... ..... .... ... . AUGITE-See...localities . .. ....... Xlcd groups of pale blue xis; Colorado .. ... ... . . .... . Cleavages, white; Tennessee...XI-prism, pale blue; Colorado. !" to :I", 15¢, or 10 for $1.00. XI-prisms. small; Colorado. Per oz., 50¢. Gemmy...VERITE (gold telluride) Xline in and on rock; Colorado. Specimens from 1 x l" to 2 x 3" at 76,t, $1.00...Rich mass; Colorado. per oz., 60¢ ... .. .............. . ..... 2.50 High grade; Colorado . . . . . |  | | 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) | | 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 Ă SCaEELâ˘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) | | 20059, USA Branch, Code 691, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA 3Faculty...rock 399 Š 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 |  | | 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 (issue) | | on Amazonite 7.5 cm, from the Smoky Hawk claim, Colorado. Collected by the Dorris family; Tom Spann photo...finest aquamarine and phenakite from Mt. Antero, Colorado, and their most publicized effort, the mining...museum quality.â (Szenics, 1967) Spruce Peak, King County, Washington, 1977 Beautiful pyrite and quartz specimens...and FLECK, G. (1980) The Grey Horse mine, Pinal County, Arizona. Mineralogical Record, 11 (4), 231â232...and HAWES, W. (1978) Quartz and pyrite from King County, Washington. Mineralogical Record, 9 (6), 352â353 |  | | Journal (article/letter/editorial) | | Cordier (1777â1861). Cordier (for whom the mineral cordierite is named) examined minerals in crushed samples...Baicheng. Diopside from the Handan iron mine, Wuâan County, Handan Prefecture, Hebei Province, occurs in crystals...Ocna de Fier-Dognecea district, Caraş-Severin County, Romania, are noted for their andradite specimens;...collection from Birdâs Station, near Bancroft, Hastings County, Ontario, reach lengths of 7.5 cm and are translucent...and phlogopite. North Burgess Township, Lanark County, Ontario, has produced some beautiful emerald-green |  | | Journal (issue) | | (RMFMS) www.rmfms.org Colorado Federation of Gem & Mineral Societies (CFGMS) Colorado Springs Mineralogical...CSMS Calendar Pg 2 Calumet Iron Mine Pg 3 Colorado Extraterrestrials Pg 6 Pebble Pups Corner Pg...provided by the Fossil Group COLORADO SPRINGS MINERALOGICAL SOCIETY PO BOX 2 COLORADO April 2013 PICK SPRINGS...303-423-5876, bjmelby@q.com. Fri-Sun, April, 19-21, COLORADO MINERAL & FOSSIL SHOW-SPRING, Denver, CO, Martin...Aumente 505-867-0425, mzexpos@gmail.com Sat., May 4, Colorado Mineral Society Mineral Auction, Holy Shepard |  | | Catalog/List | | Agglomerate .........................Custer County, Colorado " Volcanic ...............Magnet Cove, Arkansas...Amphibolite ...........................Albemarle County, Virgi11ia " (Fayalitc-bcaring) .......Near Mcsaba........San Juan County, Colorado " Porphyry ...................Boulder County, Colorado " S .............Anhydrite, crystalline ....................Lyon County, Ncvada ANORTHOSITE: Anort?, osite, gray ........Arkose-scc Sandstone " " ............... Essex County, New York dark brown ...Rochester, New York green |  | | 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) | | DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY COLORADO SCIENTIFIC SOCIETY FALL FIELD TRIP September...PROTEROZOIC VOLCANOGENIC SEQUENCES IN CENTRAL COLORADO John C. Reed, Jr. U.S. Geological Survey Trip...Leader K. Lee Shropshire University of Northern Colorado Chairman, Field Trip Committee Open-File Report...Geological Survey editorial standards Denver, Colorado 1991 INTRODUCTION1 Precambrian crystalline...exposed in the Laramide and post-Laramide uplifts in Colorado and southern Wyoming include Early Proterozoic |  | | Book (edition) | | â _ ; COLORADO GEM TRAILS AND MINERAL GUIDE ! â : ' BOOKS BY RICHARD M. PEARL Colorado Gem Trails...Trails and Mineral Guide Colorado Rocks, Minerals, Fossils Americaâs Mountain: Pikes Peak and the Pikes...Nature As Sculptor: A Geologic Interpretation of Colorado Scenery Guide to Geologic Literature Popular Gemology...Gemology Mineral Collectors Handbook Colorado Gem Trails The Art of Gem Cutting (With Dr. H. C. Dake)...Dake) * RICHARD M. PEARL â
COLORADO GEM TRAILS AND MINERAL GUIDE â
SKETCH MAPS BY MIGNON WARDELL PEARL |
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