 | | Journal (article/letter/editorial) | | northwest acro88 the cliff’s of Glen Cove to South Park and the Tarryall Mountains. Researchers have subdivided...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 |  | | Journal (article/letter/editorial) | | MINERALOGY OF THE MOUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO. II. PEGMATITESI EuceNB B. Gnoss...related alkalic granites in the Mount Rosa area, west of Colorado Springs. One is the older calc-alkalic...characterized by quartz and amazonite crystals, zircon, biotite, siderite, and minor topaz, allanite, cassiterite...of the St. Peters Dome district, Mount Rosa area,Colorado,attracted the attention of mineralogists as...Peak granite and its variants within the Mount Rosa area. The pegmatitesbelong to two principal types, a |  | | 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."...have been in the Crystal Park area. The largest fine-quality topaz specimens in Colorado occur in several...are also referred to the general discussions of Colorado topaz in Eckel (1961) and Pearl (1963) and to |  | | 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) | | 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) | | Denver, Colorado, USA © 2011 by Lithographie, LLC P.O. Box 11613 • Denver, CO 80211 • USA Phone 1.303...collection Robert Weldon photo Above: Topaz, 5.5 cm tall El Chalten, Santa Cruz, Argentina Scott Rudolph collection...Topaz ALFREDO PETROV & JOHN RAKOVAN 34. Colorful Colorado DAVID W. BUNK 42. Mongolian Topaz: The Gorkhi...and chromium can substitute for aluminum in the crystal structure. Ideal "fluortopaz" (Al2SiO4F2) would...lighter and larger than fluorine. Crystals and Crystal Structure Crystals are orthorhombic and are typically |  | | Book | | information b Book review c Crystal morphology information d Crystal drawing ff Continues on following...193-256 137-208 129-192 209-264 193-256 [ [ COLORADO-Ill] 177-256 121-184 89-168 1-120 1-88 [ ...177-256 185-280 169-248 [ 425-528 337--400 COLORADO-II] 321--400 337--400 ARIZONA-Ill] 337--400...69-132 65-128 1-64 11 / 1980 20 I 1989 [ COLORADO-I] [ 289-352 385-448 [ AUSTRALlA] 353-504...Iaria from the Howard-Montgomery quarry, Howard County, Maryland (by J. S. White) 25:53-54 AFGHANISTAN |  | | Book (volume) | | _— ’* : i mine in. q)! Y eit iia -el ~~ a a 7 : 7 ¢ z = NTs tbee _ = hee Dy...Isle Royale National Park were rendered by Superintendent John G. Lewis and Park Historian Lloyd Abelson...Barron of the Southern Gem and Mineral Company of El Paso, Texas. Information on the Virgin Valley opal deposits...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 |  | Brigatti, Maria Franca, Lugli, Cristina, Poppi, Luciano, Foord, Eugene E., Kile, Daniel E. (2000) Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado) American Mineralogist, 85 (9) 1275-1286 doi:10.2138/am-2000-8-920 | Journal (article/letter/editorial) | | Mineralogist, Volume 85, pages 1275–1286, 2000 Crystal chemical variations in Li- and Fe-rich micas from...from Pikes Peak batholith (central Colorado) MARIA FRANCA BRIGATTI,*,1 CRISTINA LUGLI,1 LUCIANO POPPI...States Geological Survey, Denver, Colorado 80225, U.S.A. ABSTRACT The crystal structure and M-site populations...Pikes Peak batholith, central Colorado, were determined by single-crystal X-ray diffraction data. Crystals...crystals). INTRODUCTION This study concerns the crystal chemistry of trioctahedral micas from pegmatites |  | | Report (issue) | | 978-0-9836323-2-0 Publisher Lithographie, Ltd. Denver, Colorado, USA Design and Layout Gloria A. Staebler © 2012...Lithographic, Ltd. PO Box 11613 • Denver, CO 80211 • USA Phone: 1.303.495.5521 • Fax: 1.303.482.1238 W\\w...petrify the frightened girl, turning her into pure crystal. Various versions impute all sorts of reprehensible...opponent would have been provided with a clear rock crystal goblet, while his clever antagonist drank water...the uncooperative archaeological fact that rock crystal goblets and other containers are abundantly documented |
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