 | | Journal (article/letter/editorial) | | COLORADO TOPAZ Topaz, Al Si0 (F,OH) is one of Colorado's better known gem minerals. Though Col orado...orado topaz may not compare in size with that found in Brazil, gemmy crystals up to 4 inches have been found...(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."... The large fragment was said to be from near Florissant. The two other crystals plus sev eral additional |  | | Journal (article/letter/editorial) | | Ihe Pikn P c i l Balhdilh dates for rocks in this area rnngc from I .7 to I .8 billion years. The zone...northeasterly-trending continentul Figure 2. Geologic map of the Colorado Front Range showing the Precambrian metamorphic...Karistrom 1978; Lanthier 1978). Farther south in Colorado, sediments accumulated in decper-water rocks formed...Survey into “Early, Middle, and Late” Eras. In Colorado we because of the subsequent folding and overthrusting...subduction zone and possibly the creation Era in Colorado and Wyoming of a volcanic island arc. Carpenter |  | | 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 (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 (volume) | | Chicago, 111. Colorado College Publications: Science Series, vol. 12, no. 6. Colorado Springs, Colo.... Colorado School of Mines: Bulletin, vol. 4, no. 2. Golden, Colo. Colorado Scientific Society: Proceedings...pp. 363-422, vol. 9, pp. 5-112. Denver, Colo. Colorado, University of: Studies, vol. 5, nos. 2-4, vol...Bulletins, nos. 10-12. Hartford, Conn. Delaware County Institute of Science: Proceedings, vol. 3, nos...Development Company's Survey. Charleston, Kanawha County, W. Va., 1907. 28 pp., 4 pis. Gives information |  | | Report (volume) | | Journal, vol. 20, nos. 5-7. Cincinnati, Ohio. Colorado College Publications: Science Series, vol. 11...11, nos. 46-53, vol. 12, nos. 1-5. Colorado Springs, Colo. Colorado School of Mines: Bulletin, vol. 3,...Golden, Colo. Colorado Scientific Society: Proceedings, vol. 8, pp. 71-362. Denver, Colo. Colorado, University...10,11, 12, pp. 1-94. Davenport, Iowa. Delaware County Institute of Science: Proceedings, vol. 1, nos...features of Maryland; vol. 6; Calvert County; St. Mary's County; State Map. Baltimore, Md. Mazama, vol |  | | 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...deposits. Permission to visit other mines in the Pala area was kindly granted by Charles Reynolds of Lilac...GEMSTONES Diamond, Corundum (Ruby and Sapphire), Beryl, Topaz, Opal. IMPORTANT GEMSTONES The Feldspar Group, Spodumene...crystals . Map of Corundum Hill—Ellijay area . Map of Cowee Creek area . Cowee Creek gravel washing . Yogo |  | | Report (issue) | | of The Geological Society of America Boulder, Colorado, 1973 Edited by BRUCE F. CurTIS 1975 Copyright...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 |  | | Book | | old-time quality galena—from the © tri-state mining area of Missouri, Oklahoma, Kansas —was disappearing...originally. Shiny black rutile crystals from Mono County, California, are just as good but smaller. Small...Alma, Colorado, were almost the only specimens available. Now, a small new discovery in Colorado of large...recent rediscovery of elbaite near Pala in San Diego County, California, greatly stimulated an already high...two-colored crystals appear now and then. 2010 County, New Mexico, with its blue-green Madagascar (now |  | | Book (edition) | | Rock-Mineral Associations — Importance of Knowing Area Rocks — Signs of Mineralization in Granites — Spotting...Distances Plotting a Position Land Subdivisions, USA Land Subdivisions, Canada Student Rock and Mineral...Sapphire Mine Entering a Gem Pocket Specimen Deposits Topaz Pocket Removing a Pocket Detaching Cavity Linings...go. Planning includes travel arrangements to the area, location of exact positions of mines or quarries...preparation must be to learn as much as possible about the area or deposit to be visited: where to @0, what to look |  | | Book (edition) | | Rock-Mineral Associations - Importance of Knowing Area Rocks Signs of Mineralization in Granites - Spotting...Distances 4. Plotting a Position 5. Land Subdivisions, USA 6. Land Sutxiivisions, Canada 7. Student Rock and...Sapphire Mine Entering a Gem Pocket Specimen Deposits Topaz Pocket Removing a Pocket •• XVII 163 164 169...go. Planning includes travel arrangements to the area, location of exact positions of mines or quarries...preparation must be to learn as much as possible about the area or deposit to be visited: where to go, what to look | | | Book (edition) | | Rock-Mineral Associations - Importance of Knowing Area Rocks Signs of Mineralization in Granites - Spotting...Distances 4. Plotting a Position 5. Land Subdivisions, USA 6. Land Subdivisions, Canada 7. Student Rock and...Sapphire Mine Entering a Gem Pocket Specimen Deposits Topaz Pocket Removing a Pocket •• XVII 163 164 169...go. Planning includes travel arrangements to the area, location of exact positions of mines or quarries...preparation must be to learn as much as possible about the area or deposit to be visited: where to go, what to look |  | | Report (volume) | | Quart.-Colorado School of Mines Quarterly. Golden, Colo. Colo. Univ. Studies, Gen. Ser.-Colorado University...Chicago. _ . Los Angeles County Mus. Quart.; Sci. Ser., Paleontology-Los Angeles County Museum Quarterly; Science...Mem.-Montana Bureau of Mines and Geology Memoirs. Butte, Mont. Natl. Acad. Sci. Proc.-National Academy of...implications of geological reconnaissance in the Plains area-Missouri River Basin, in Am. Soc. Testing Materials...Long and Spragge townships, Blind River uranium area, District of Algoma: Ontario Dept. Mines Prelim |  | | Report (volume) | | Crossroads: Lyons, P. L., 4. Gilbert H., 10. Colorado, South Silverton area: Expanding horizons: Lay, R. L.,L Geophysicist..., 11. D. J. Rocky Mtn. geosyncline in Canada: Colorado Plateau: Wengerd, Warren; P. S., 4. S. A., 6....Reading: Military Service Pub. Co. Texas, Tordilla Hill area, color: Shale nomenclature: Clark, T. H. ,6. South...Div. Mines, 1; Jenkins, O. P., Choctaw County, Highway 17 area: 3. Toulmin, L. D., Jr., 3. Minor: Wright...Indian Mtn. area: Crawford, Potash: Calif. Dept. Nat. Res. T. J., 1. Div. Mines, 33. Piedmont area: Baker |  | | Report (volume) | | cientifica Circular Classe classification Company, County Collections Committee Communications Comparative...Publications vols. 4-8 (no. 2). Cleveland, Ohio. Colorado Mining Association Mining Year Book, 1934-35,... 1935-36, 1937, 1939. Denver, Colo. Colorado Museum of Natural History: Popular Series no. 3; Proceedings...Proceedings vols. 1317 (no. 1). Denver, Colo. Colorado School of Mines: Mines Magazine vols. 19-24; Quarterly...Golden, Colo. Colorado Scientific Society Proceedings vols. 12-14 (no. 2). Denver, Colo. Colorado University: |  | | Report (volume) | | Proc.-Colorado Scientific Society Proceedings. Denver, Colo. Colo. Univ. Studies, Gen. Ser.-Colorado University...of the Strawn-Canyon seHes' in the Brazos River area, north central Texas, November 19. . . 20, 1954...Geol. Soc., [Guidebook] Cambrian Field Trip-Llano area, Mar. 1954, p. 70-73, illus. [1964]. . .. 3.·. Scientific...·and · zinc-lead-barite deposits in an area in Lafayette County east of Cuba City, Wisconsin: U. S. Geol...c.anal· ..' · -yol,orado-Big Thompson Projec~ Colorado: U.S. llur_.Recl_ .· ~ation, Eng. Geology Br. |
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