 | | Book (edition) | | and often gems can be found. valuable For the mountain ranges and level for the ist to States contain... a little experience, the gem "heft" of a specimen to his rough field for instance, that massive...and profitable 7 he judges a puzzling mineral specimen In the laboratory, use is made of in the field...and Washington occur the many types of agate, opal and petrified this region is noted. The agate...the mother rock. In general, the United States mountain them. is divided geologically into the areas |  | | 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 |  | | Book (edition) | | MILEAGE L OGS. REVISED EDITION Revised Edition, COLORADO GEM TRAILS AND MINERAL GUIDE HICllAHD :--1. PEARL...an extensive ¥em and mineral collecting tour 01 Colorado, revealing the interesting places where Nature...Swallow, Publisher) 2679 South York Street Denver, Colorado 80210 - , =· - ·, BOOKS BY RICHARD M. PEARL...Exploring Rocks, Minerals, Fossils in Colorado America's Mountain: Pikes Peak and the Pikes Peak Region...Atlas of Colorado American Gem Trails Nature As Sculptor: A Geologic Interpretation of Colorado . Scenery |  | | Book (edition) | | — _ ; COLORADO GEM TRAILS AND MINERAL GUIDE ! ■ : ' BOOKS BY RICHARD M. PEARL Colorado Gem Trails...Trails and Mineral Guide Colorado Rocks, Minerals, Fossils America’s 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 ★ COLORADO GEM TRAILS AND MINERAL GUIDE ★ SKETCH MAPS BY MIGNON WARDELL PEARL |  | | Journal (article/letter/editorial) | | 1, 1944 STRUCTURE AND PETROLOGY OF SPECIMEN MOUNTAIN, COLORADO BY ERNEST E . WAHLSTROM CONTENTS Page...ILLUSTRATIONS Figure Page 1. Outline map of north-central Colorado................................................................... 78 2. Geologic map of Specimen Mountain area............................................... 81 3. Geologic cross sections of Specimen Mountain.............................................Iceberg Lake to Specimen Mountain................ 84 6. Larsen plots of Specimen Mountain rocks........ |  | | Journal (article/letter/editorial) | | DEPOSITS IN THE SPECIMEN MOUNTAIN VOLCANICS, ROCKY MOUNTAIN NATIONAL PARK, COLORADO EnNBsrE. Wanrsrnou...Colorad.o. Assrnecr Specimen Mountain, in Rocky Mountain National Park, Colorado, is a denuded Tertiary...hydrothermal solutions rising from depth. Jasper and opal deposited from these solutions have ieplaced pitchstone...geodes, partly or completely filled with agate, onyx, opal, calcite, and minor amounts of allophane and chloropal...551 552 .)JJ 55s 55s 556 559 561 LocerroN Specimen Mountain (elevation 72,482feet) is a prominent landmark |  | | Report (volume) | | and sapphire are considered precious gems. Some opal is precious, but most varieties are semiprecious...streams, and eventually deposited as alluvial gravels. Opal and agate are formed from aqueous solutions. Diamonds...Del Norte County; Trinity River, Trinity County; Spanish Creek and Gopher Hill, Plumas County; Placerville...Dorado County; Cherokee Flats, Yankee Hill,and Oroville, Butte County; French Corral, Nevada County; Indian...Indian Gulch and Volcano, Amador County; and Alpine Creek, Tulare County. Other western localities are: |  | | Journal (article/letter/editorial) | | COLORADO TOPAZ Topaz, Al Si0 (F,OH) is one of Colorado's better known gem minerals. Though Col orado...(PJM), 975 (TCM) Box 25046, Federal Center Denver, Colorado 80225-0046 A ccording to Cross and Hillebrand...discovery of Colorado topaz was made about 1880 by a Mr. Thiebald,* "a prospector of Colorado Springs."...area. The largest fine-quality topaz specimens in Colorado occur in several separate and distinct localities...are also referred to the general discussions of Colorado topaz in Eckel (1961) and Pearl (1963) and to |  | | Book | | comfort and time to hold in their hands a single specimen of a gemstone never before seen by human eyes...is enhanced. They could probably buy a similar specimen in a rock shop or jewelry store for a fraction...desires. Sometimes the talus slopes at the base of a mountain contain rich indications of a dike or sill above...famous was the single beryl stone found in Oxford County in Maine that weighed 18 tons and was 18 feet in...well as to visualize the original state of the specimen. This chapter has given only the most simple introduction |  | | 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...Dosen ONN/ QBI96-40247 Trade Distribution by Mountain Press Publishing Company P.O. Box 2399, Missoula...Cantlin, Ellis, [D; Jeannette B. Carillo, Gem Center USA, EI Paso, TX; Gary Christopher, The Prospectors Cache... Hughes, Boulder, CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal |  | | Book (volume) | | El Paso, Texas. Information on the Virgin Valley opal deposits was given by G. Keith Hodson of Scottsdale...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...Diamond, Corundum (Ruby and Sapphire), Beryl, Topaz, Opal. IMPORTANT GEMSTONES The Feldspar Group, Spodumene...Turner Emerald Mine . Mt. Antero aquamarine matrix specimen . Mesa Grande morganite crystal . Four topaz crystals |  | 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) | | October 2014 from the Del Norte Area, Saguache County, Colorado DANIEL E. KILE U.S. Geological Survey 3215...3215 Marine Street, Suite E-127 Boulder, Colorado 80303 dekile@usgs.gov Figure 1. View of the Del Norte...late 1800s, the thunder-egg beds near Del Norte, Colorado, have provided the collector in recent times with...those capping the Table Mountains near Golden, Colorado. The nodules are approximately spherical in shape...is partly to completely filled with chalcedony, opal, or quartz and that may exhibit a geometrical, star-shaped |  | | Journal (article/letter/editorial) | | Knute Carlson, Box 702, Wasilla, Alaska. The black specimen is basanite (quartz). The other consists of dark...the results are." Readers desiring to obtain a specimen or two of this unusual quartz crystal are urged...MINERALS not easy to collect now. The other specimen is from Stevenson (Fairfield Co.), Conn., in a...is an attractive specimen. ILLINOIS — "Under separate cover I am sending you a specimen which I would like...Co.), 111. You will notice that a part of the specimen is polished (amateurish of course). I polished | | | Book (volume) | | 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...Cantlin, Ellis, ID; Jeannette B. Carillo, Gen1 Center USA, El Paso, TX; Gary Christopher, The Prospectors Cache...W Hughes, Boulder, CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal...James D. Lindberg, Las Cruces, NM; Jack Lowell, Colorado Ge1n & Mineral Co., Tempe, AZ; Steven & Lorna |  | Burt, Donald M., Sheridan, Michael F., Bikun, James V., Christiansen, Eric H. (1982) Topaz rhyolites; distribution, origin, and significance for exploration. Economic Geology, 77 (8) 1818-1836 doi:10.2113/gsecongeo.77.8.1818 | Journal (article/letter/editorial) | | soccuron both sidesof the ColoradoPlateau (in Colorado,New Mexico, Arizona, Utah, and Nevada) and in...Introduction occurrencein a lava flow near Nathrop, Colorado, IN 1884 Whitman Crossdescribedtopaz, A12SiO4F2...porphyriticrhyolitedomeat Chalk Mountain, and garnet in samplesof lithophysalrhyolite lava Colorado,lessthan4 km westof...Crossreviewedthisand a similar 1959, the Spor Mountain beryllium depositswere discoveredin this same...Stewartet as water-laid tuffs (especiallyat Spor Mountain, al., 1977). Utah).Thisusageisincorrectandshouldbedropped |  | | Book (edition) | | from the Tourmaline Q ueen .1ine, Pala, San Diego County, California. From a pen-and-ink drawing by W. E...PRINCIPAL GEMSTONES Diamond, Corundum, Beryl, Topaz, Opal. II 68 IMPORT ANT GEMSTONES The Feldspar Group...crystal forms 23. Views of opal mines, Spencer, Idaho 24. Nodules bearing opal, Spencer, Idaho 25. Drawing...of hyalite opal specimen, Mexico 26. Hyalite opal photomicrograph 2 7. Map of Honduras opal sources 28...Miners at Crystal Peak, Colorado 30. Pegmatite pocket, Crystal Peak, Colorado 31. Spodumene, Pala Chief |  | | Journal (article/letter/editorial) | | (1940). ORE-BEARING PIPES IN TI{E TARRYALL RANGE' COLORADO ROBERT D. BUTLER AND I,. B. RII,EY A number...Gillespite, Feo.Bao.4Sior, in Alaska'and in Mariposa County, California, with sanbornite, BaO'2SiOz, and barium...characteristic of other igneous masses of the White Mountain magma series. Pegmatite, aplite, and late lamprophyre...resembling tetradymite, from Glacier Gulch, Hudson Bay Mountain, near Smithers, B C., give identical r-ray powder...ferent from those given by tetradymite-BizTerS specimen from Brazil represents the material originally |  | | Book (volume) | | Varieties: Lussatite; Opal, 280 Occurrence, 281 Historical, 283 Melanophlogite, 283 OPAL Mode of Aggregation...fine-grained varieties of quartz, together with opal, were known as distinct entities over 2000 years...identification of the so-called amorphous substance opal as a variety of cristobalite and the clarification... mately 84 in. (21 cm) in length. Pikes Peak, Colorado. Crystal approxi- Amer. Mus. Nat. Hist. coll...average of 1.2° per cm.® A crystal from Pikes Peak, Colorado, of normal habit elongated along the c-axis showed |  | Bishop, Janice L., Parente, Mario, Weitz, Catherine M., Noe Dobrea, Eldar Z., Roach, Leah H., Murchie, Scott L., McGuire, Patrick C., McKeown, Nancy K., Rossi, Christopher M., Brown, Adrian J., Calvin, Wendy M., Milliken, Ralph, Mustard, John F. (2009) Mineralogy of Juventae Chasma: Sulfates in the light-toned mounds, mafic minerals in the bedrock, and hydrated silica and hydroxylated ferric sulfate on the plateau. Journal of Geophysical Research, 114. doi:10.1029/2009je003352 | Journal (article/letter/editorial) | | the wall rock, and light-toned layered deposits of opal and ferric sulfates on the plateau. Hyperspectral...Institute, Mountain View, California, USA. NASA Ames Research Center, Mountain View, California, USA. 3 Department...Stanford, California, USA. 4 Planetary Science Institute, Tucson, Arizona, USA. 5 Jet Propulsion Laboratory...California, USA. 6 Department of Geological Sciences, Brown University, Providence, Rhode Island, USA. 7 Johns...University Applied Physics Laboratory, Laurel, Maryland, USA. 2 Copyright 2009 by the American Geophysical Union |  | | Report (issue) | | the Rocky Mountain Section meeting of The Geological Society of America Boulder, Colorado, 1973 Edited...SOCIETY OF AMERICA, INC. 3300 Penrose Place Boulder, Colorado 80301 24 AUG 1990 The Memoir series was originally...northwestern Colorado and its implications concerning tectonism and the origin of the Colorado River system...Cenozoic sedimentation and deformation in northern Colorado and AGIOS ATCAGws jaceeet ty pes wien ano os Kar...helt 249 Neogene tectonism in south-central Colorado... a 2) 7 min 4 am ie a - =a, geek @a |  | | Report (volume) | | Pa. Colorado Museum of Natural History: Proceedings, vol. 13 (nos. 1-3). Denver, Colo. Colorado Scientific...Proceedings, vol. 13 (nos. 4, 5). Denver, Colo. Colorado School of Mines: Mines Magazine, vols. 23, 24...Colo. Colorado, University of: Studies, vols. 20 (nos. 2-4), 21, 22 (no. 1). Boulder, Colo. Colorado-Wyoming...Frederick James. 20. Middle River gold field, Victoria County, Nova Scotia: Canada, Geol. Survey, Summary Kept...Genesis of the mica pegmatite deposits of Latah County, Idaho: Econ. Geology, vol. 28, no. 1, pp. 41-58 |  | | Report (issue) | | Geology and Ore Deposits of the Front Range Colorado By T. S. LO\'ERING and E. N. GODDARD GEOLOGICAL...in cooperation with the Colorado State Geological Survey Board and the Colorado Metal Mining Fund ~ oopr..._____________________ _ Copper deposits in Jefferson County __ _ F. M.D. property _____________ _ Malachite...________________________ _ Cherry Creek and Douglas County placers _________________________ _ Mining districts..._______ _ Dives-Dunkirk lode ________________ _ Colorado Central vein ______________ _ Griffith lode _ |  | | Book | | indebted. Appreciation is also expressed to Dr J. Arem, USA; Sr Carlos Barbosa, Brazil; Professor J. Cassedanne...Canada; Mr T. Michalski, USA; Mr J. Murphy, USA; Dr F. Pough, USA; Mrs K. Robertson, USA; Dr W. Sersen, Thailand;...Thailand; Mr M. Sonsthagen, USA; A. Theisen, USA; John White, USA; and many others in the trade who assisted...throughout the world. Brown - topaz rhyolites in western USA, and Mexico. Many pegmatites throughout the world...weight of 300 kg, is from the Brown Derby mine, Colorado, USA (Rosenberg,1972; Staatz and Trites, 1955). This |  | | Book (edition) | | has described a similar occurrence from '' Specimen Mountain," iu (Am. J. Sci., III., the Yellowstone Park;...varieties of hematite ; of the last, in chalcedony, opal, and other species. The above terms are indefinite...wholly of a crystalline structure internally, as most opal. Such a structure is also called colloid or jellylike...of firm, solid minerals is fii'st to weigh the specimen accurately on a good cheuiical balance, then suspend...often be found well to moisten the surface of the specimen If it before inserting it in the water, and sometimes |
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