 | | Report (volume) | | the Browns Canyon Wilderness Study Area, Chaffee County, Colorado U.S. GEOLOGICAL SURVEY BULLETIN 1716-C...the San Isabel National Forest, south-central Colorado: U.S. Geological Survey Bulletin 1638, p. 40-42...SOUTH-CENTRAL COLORADO Mineral Resources of the Browns Canyon Wilderness Study Area, Chaffee County, Colorado...Area, Chaffee County, Colorado. (Mineral resources of wilderness study areas South-Central Colorado; ch...Mines and mineral resources Colorado Browns Canyon Wilderness. 2. Geology Colorado Browns Canyon Wilderness |  | | 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...Rhyolitic ash-flow tuff ______________________ _ Nathrop Volcanics _________________________ _ Browns Canyon...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 |  | | 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 |  | | Journal (article/letter/editorial) | | Note: Gold in Rhyolite at Nathrop, Colorado Denver Nathrop # Pueblo COLORADO DAVID E. SEAMAN 36 Winter...Winter Street Norway, Maine 04268 Ruby Mountain at Nathrop, Colorado, has been noted for many years as...while a grad uate student at the University of Colorado in 1932. That was the year of my first collecting...Arizona, New Mexico, and returning once again to the Nathrop, Colo rado site. We collected garnets and topaz...concentric in structure, occurring in rhyolite, obsidian, and allied rocks. A greatly magnified sketch |  | | Book | | based on Kemp's "Handbook Glasses: Utah Utah Obsidian Utah 1. Scoria 4. 2. Pumice 5. 3. II.... 6. 7. 8. 9. 10. 11. Rhyolite Colorado Mass. Felsite (Aporhyolite) Quartz-Felsite Porphyry Mass. Quartz-Felsite...Porphyry South Dakota Rhyolite Porphyry (Nevadite) Colorado Pumiceous Rhyolite 13. 14. 15. 16. 17. 18...Granite Mass. Binary Granite N. H. Binary Granite Colorado Biotite-Granite R. I. Biotite-Granite Vermont...Sanidine-Trachyte Colorado Trachyte Porphyry S. Dakota 23. Bostonite 27. 28. 29. Phonolite Colorado Leucite-Syenite |  | | Book (edition) | | and often gems can be found. valuable For the mountain ranges and level for the ist to States contain...KYANITE LAZULITE t^^*l IDOCRASE lOLITE k:^ RUBY /^^ RUTILE SAPPHIRE 1^ TOURMALINE CRYSTALS ...the mother rock. In general, the United States mountain them. is divided geologically into the areas...the east and west, and the plains between The mountain regions in the east from Maine down through...McDowell Co. 1877 2% White, flawed King's mountain, 1893 % Canary yellow Cleveland Co. GEORGIA |  | | Journal (article/letter/editorial) | | RhyoliCe of.Ruby Mountein of theNathrop Volcanics Colorado 35048 ' (Oligocene), very phenocryst poor rhyolite... Noble, unpub. data) 6. RhyoliCe of Shoshone Mountain (Fliocena)⢠aphyrtc rhyolite (Orklld, 1971) Sample...9 Rhyolite California 41038' 121030 ' 10 Obsidian 37ø38 ⢠118ø49 ' California 33ø14.8 ' 115036... California 33ø10.3' 115ø38 ' 13 N-212-4 Obsidian California 41033 ' 121ø39 ' 14 Wyoming 44042...44042 ' 110059 ' 15 YP-53-121 Obsidian New Mexico 35ø57 ⢠106036 ' 16 4DO-69 Rhyolite Wyoming |  | | Book (edition) | | MILEAGE L OGS. REVISED EDITION Revised Edition, COLORADO GEM TRAILS AND MINERAL GUIDE HICllAHD :--1. PEARL...an extensive ÂĽem 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 |  | | Report (volume) | | Bibliograplw: p. 13 Supt. of Docs. no.: L 2.3:1489 1. Obsidian. 2. Tektite 3. Radioactive dating. 1928- I. lzett...listed in table 1------3. K-Ar analytical data for obsidian samples of table 1 not previously listed in published...data for two of the non hydrated glasses (one obsidian and one tektite) show that they have not been...dated 24 samples of nonhydrated natural glass (obsidian and tektite) by the fission-track method, and...a vitrophyre of a welded tuff from Wyoming, an obsidian from South America, and a tektite (moldavite) |  | | Journal (article/letter/editorial) | | J.N.ROSHOLT U.S. GeologicalSurvey, Denver, Colorado, USA and D.C.NOBLE Department of Geological Sciences... Harvard University, Cam bridge, Massachusetts, USA Received 20 May 1969 Dense primarily crystallized...lava. The nonhydrated glass occurs as relict âobsidian coresâ surrounded by secondarily hydrated glass...0.94 +-0.01 0.98 + 0.01 1.0 Nathrop Volcanics (Oligocene), Colorado (aphyric rhyolite lava) [ 16, 17]...from the Western United States [6, 19]. The Ruby Mountain glass is unusually rich in uranium. The thorium |  | | 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 |  | | Book (volume) | | SOUTHWESTERN QUADRANT Arizona, Arkansas, California, Colorado, Louisiana, Nevada, New Mexico, Oklahoma, Texas...Southwestern Quadrant Arizoni, Arkansas, California, Colorado, Louisicna, Nevada, New Mexico, Oklahoma, Texas...Location Numbers Arizona Arkansas California Colorado 258 Louis B30 ana HOW TO USE THIS BOOK...volumes, through very precise directions and accurate county maps, to get you to the best and most accessible...for the county in which it is located. This site number also appears under the given county in the text |  | | Report (issue) | | dacitic perlite, welded tuff, pitchstone, and obsidian is included mainly to show the water content....has this property been1 utilized commercially. Obsidian was reported to have been expanded and used in...content may range from less than 1 percent in some obsidian to as much as 10 percent in some pitchstone. Most...of 18 analyses.. \(Johannsen, 1932, p. 381,) 6. Obsidian, average of-41 analyses,. \(idem, p, 278,') 100...very rarely blue. Some, dense varieties,, such as obsidian, break withconchoidal fracture. Certain varieties |  | | 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...above sea level; with more than eight hundred mountain peaks exceed ing 11,000 feet, the average elevation...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 |  | | Book | | oxygen form the minerals ruby and sapphire. The pigeon-blood red of the ruby is thought to result from...magnetite, zircon, gold, platinum, topaz, beryl, ruby and sapphire. One important rock in this group is...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...Quartz, sapphire, fine emerald, some agate, some obsidian, topaz and diamonds are glassy or have a vitreous |  | | Journal (issue) | | Julius Weber Mamaroneck, New York COLORADO ISSUE #2 Articles Colorado locality index.............................. 323 by B. L. Muntyan Whatâs new in Colorado minerals? ......................................339 by M. I. Jacobson The San Juan Mountains of Colorado ..................................349 by J. A...10 cm tall, from the Yucca Hill claim, Park County, Colorado. Richard A. Kosnar specimen; photo by John...Natural History for conceiving the idea of a second Colorado issue and for helping a great deal in bringing |  | | Book | | MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Sine â_â< ¢ 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 resourcesâColorado. 2. Mines and mineral resourcesâNew Mexico. I. Kennedy, Marrianna...minerals of the Great American Rift in New Mexico and Colorado. Great American Rift is the name we use for a |  | | 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 (volume) | | A. F. Rogers, Stanford University, Palo Alto. Colorado.........Prof. R. D. George, Boulder. Connecticut...See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities: Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20, Pv. 7 E.; Jefferson...Jefferson County, at Elyton; Lee County, at Chewacla lime works; St. Clair County, at Gfeensport; Shelby |  | | Book (volume) | | 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...Effects. PRINCIPAL GEMSTONES Diamond, Corundum (Ruby and Sapphire), Beryl, Topaz, Opal. IMPORTANT GEMSTONES...Gabbro-Diorite, Lepidolite and Muscovite Mica, Obsidian, Banded Rhyolite, Pectolite, Datolite, i ) ...Mt. Mica Eh Towne Quarry 180 Tourmaline Queen Mountain IgI Tourmaline crystal (color) following 112 Tourmaline |  | | 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 |  | | Report (issue) | | mineral resources of the Browns Canyon area, Chaffee County, Colorado By A.M. Leibold 1 , D.E. Detra 1 , and...does not imply endorsement by the USGS. Denver, Colorado UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL...mineral resources of the Browns Canyon area, Chaffee County, Colorado By A.M. Leibold 1 , D.E. Detra 1 , and...does not imply endorsement by the USGS. Denver, Colorado CONTENTS Page INTRODUCTION...................basin map of the Browns Canyon study area, Chaffee County, Colorado Geologic map and geochemical sample location |  | | Report (issue) | | Prepared in cooperation with the Colorado Geological Survey for the United States Department of Agriculture...Service Development of Industrial Minerals in Colorado Circular 1368 U.S. Department of the Interior...Survey Development of Industrial Minerals in Colorado By Belinda F. Arbogast, Daniel H. Knepper, William...John S. Dersch Prepared in cooperation with the Colorado Geological Survey for the United States Department..., 2011, Development of industrial minerals in Colorado: U.S. Geological Survey Circular 1368, 87 p. Library |  | | Journal (article/letter/editorial) | | tears of these which we found on our trip will (Obsidian), opaque volcanic glass in be mentioned below...was a big hole, dug by mining operations into a mountain. The mineral which is mined there now is clay...Moab is, of course, not accessible to collectors. Colorado Route 90. Very near the Utah Border. There are...road (on the left hand side when going towards Colorado). Pieces of white sandstone picked up at the side...and phosphorescent but not radioactive. Ouray, Colorado. On U. S. Route 550, 97 miles south of Grand Junction |  | 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). |
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Ruby Mountain, Nathrop, Chaffee County, Colorado, USA