 | | 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...pegmatites consists chiefly of radioactive zircon, fluorite, astrophyllite, thorite, and lesser amounts of...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 |  | | 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...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...body of literature. The first published list of Colorado mineral localities (in cluding quartz) was included |  | | 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 (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 (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 |  | | 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 |  | | Book | | Hditore, Verona. Contents PART I: COLLECTIONS Fluorite Mimetite 18 ‘Tourmaline Sulfur 22 Vanadinite...they include gemstones such as carnelian, rock crystal, lapis-lazuli, citrine, amethyst, and others that...sculptured masses of thick and thin twisted wires and crystal groups from the mines of Kongsberg, Norway. Specimens...great 254-carat crystal in the Smithsonian collection is a well-formed complete crystal and is the largest...largest preserved uncut crystal on record. Smaller but even more perfect crystals are usually available |  | 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 |  | | Journal (article/letter/editorial) | | Ungaretti Eur. J. Mineral. 2003, 15, 349–355 Crystal structure and chemistry of lithium-bearing trioctahedral...Denver, Colorado, 80225, U.S.A., e-mail: dekile@usgs.gov Abstract: Chemical analyses and crystal structure...anorogenic Pikes Peak batholith (Colorado) to characterize the crystal chemistry and relations with trioctahedral...closer to the siderophyllite end-member. Single-crystal X-ray refinements were carried out on three samples...which were taken from core and rim of the same crystal) in space-group P3112 (the agreement factor, Robs |
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