 | | Journal (article/letter/editorial) | | Although Colorado may be most noted for rhodochrosite or amazonite, the many varieties and associations...associations of quartz found throughout the state rank it as one of the premier worldwide localities for that...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...for about 750 known mineral species.* Of these, quartz is one of the most desirable from a collector's...to Minerals of Colorado: A 100-Year Record (Eckel, 1961). 374 ROCKS & MINERALS Quartz was a familiar |  | | Report (issue) | | . . .. . . . .. . .. . .. .. . . .. Multison Park . . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . • . . . . Yellowstone National Park. . . . . . . . . . . . . . . . . . . . . . . • •.... . . . 114 lB . Gold leaf fitling fracture in quartz from the Goodhope mine , Lew iston district . ...that contained abundant visible gold in altered quartz diorite. Other beautiful specimens have been collected...a hundred mines and prospects over a 200 -square-mile region. In southeast Wyoming, portions of the Medicine |  | | Book (edition) | | THE OF GEOLOGY CARBONATITES HARRY VON ECKERMANN THE GEOLOGY OF CARBONATITES E. Wm. HEINRICH...Heinrich, Eberhardt William, 1918The geology of carbonatites. Reprint of the ed. published by Rand McNally...Chicago. Bibliography: p. Includes index. 1. Carbonatites. eeathes [QE389.61.H4 1979] 5520.1 78-27358...Geology of Carbonatites first appeared, scientific and technological interest in carbonatites has remained...convening of the First International Symposium on Carbonatites in Pocos de Caldas, Brazil for which this writer |  | | Book | | MINES AND MINERALS OF THE GREAT AMERICAN RIFT (COLORADO-NEW MEXICO) Sine —_—< ¢ 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 resources—Colorado. 2. Mines and mineral resources—New 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 |  | | Book | | mid-1957, of vvhich 70% is in New Mexico, 16% in Colorado, Utah, and Arizona, and 8% in Wyo1ning. These...siliceous and Ruoritic types, and the oxidized Colorado Plateau deposits are desc1ibed vvith those that...origin, e.g., Blind River, \i\litwatersrand, and Colorado Plateau. The writer has attempted to present equitably...195 201 205 211 217 217 221 222 Chapter 6 : CARBONATITES AND RELATED DEPOSITS General . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . Colorado Plateau . . . . . . . . . . . . . . . . . . . |  | | Journal (issue) | | Photo: 5.1.Pekov. The Baringer Hill Pegmatite Llano County, Texas Art Smith artsmithite@msn.com Introduction...the specimens is meager usually giving just Llano County or 5 miles south of Bluffton. However, when reading...were few other pegmatites recognized in the Llano County area so Baringer Hill can be accepted as their...low-water reveals that the high banks above the Colorado River is littered with many small pegmatite dikes...evident that they had already been dug out. The smoky quartz crystals were taken and then they were filled back |  | | Report (issue) | | Deposits Hosted in Pegmatites, Alkaline Rocks, and Carbonatites in the Islamic Republic of Mauritania: Phase...deposits hosted in pegmatites, alkaline rocks, and carbonatites in the Islamic Republic of Mauritania (phase...meter (m) 3.281 foot (ft) kilometer (km) 0.6214 mile (mi) Area hectare (ha) 2 square meter (m ) 2 ... acre 0.3861 square mile (mi2) Volume 3 cubic kilometer (km ) cubic mile (mi3) 0.2399 Mass gram...Nations Development Program US United States USA United States of America USGS United States Geological | | | Report (issue) | | Deposits Hosted in Pegmatites, Alkaline Rocks, and Carbonatites in the Islamic Republic of Mauritania: Phase...deposits hosted in pegmatites, alkaline rocks, and carbonatites in the Islamic Republic of Mauritania (phase...meter (m) 3.281 foot (ft) kilometer (km) 0.6214 mile (mi) Area hectare (ha) 2 square meter (m ) 2 ... acre 0.3861 square mile (mi2) Volume 3 cubic kilometer (km ) cubic mile (mi3) 0.2399 Mass gram...Nations Development Program US United States USA United States of America USGS United States Geological |  | | Journal (article/letter/editorial) | | isotopeanalyseswere obtainedfor 50 whole-rocksamples,26 vein quartz samples,4 calcites,and 1 adulariafrom the volcanicrocks...+1.5); Sandgrass andesite(--6.0); main-stagevein quartz (-5.1 to --1.8); late, euhedralquartz crystals...occurredat about 250ø-300øC. Although the •O ts of quartz is higher (+1.5 to +3.0), the rangeof whole-rock$O•s...bodies occur in quartz-rich replacement samplesof the variousvolcanicrocksand on quartz veins formed along...variousgenerationsof quartz were made setsof faults cut a 4,000 foot-thick sectionof volcanic on one quartz sample |  | | Journal (issue) | | Marvin Hanner Additions to the Ore Mineralogy of Colorado.................................................by Donald Grybeck Crystallized Minerals of the Colorado Mineral Belt.................................... 1973). T he crys tals occur with trem olite, quartz and calcite in talc-filled pockets that have developed...Lapidary Journal, 27, No. 7, 1040. ITALIAN MOUNTAIN, COLORADO by M. M. Groben Italian M ountain (elevation 13...betw een A spen and Crested Butte in w estern Colorado. Although probably visited by early miners, it |  | | Journal (article/letter/editorial) | | species include azurite, pyromorphite, fluorite, quartz, and calcite. Then there are the minerals that...pseudomorph siderite include hematite, magnetite, quartz, cacoxenite, calcite, barite, and various chlorite...rare component of pegmatites and is found in carbonatites, a rare igneous rock type composed chiefly of... Figure 2. Siderite with quartz, from Mine Hill, Roxbury, Litchfield County, Connecticut. The composite...were collected from Mine Hill, Roxbury, Litchfield County, where large cleavage masses to 11 cm on edge and |  | | Journal (article/letter/editorial) | | characterized by very coarse grained hydrothermal quartz, calcite, and fluorite. Also, the rare mineral...the Coeur d’Alene district. Fluid inclusions in quartz, fluorite, ankerite, and parisite from the Snowbird...known for Ag-Pb-Zn mineralization that occurs in quartz-siderite sulfide veins (hereafter referred to as...ankerite, quartz, and chalcopyrite; and calcite-dominant “Snowbird-type” veins that contain quartz, calcite...Columbia (Samson et al., 2001), South Platte, Colorado (Simmons and Heinrich, 1980; Levasseur and Samson |  | | Journal (issue) | | Cooper Nottingham, England Anthony R. Kampf L.A. County Mus. of Nat. Hist. Los Angeles, CA Joseph A. Mandarino...Marchesini & R. Pagano The Shirley Ann claim, Inyo County, C a lifo r n ia ................................Publishing P.O . B ox 37072 T ucson, Arizona 85740 USA Tel: (520) 798-1513/(520) 297-4862 FAX: (520) 79...often partially filled by epidote, prehnite and quartz, all of them commonly in good crystals. Calcite...Epidote with orthoclase (adularia variety) and quartz was collected here. Similar specimens were also |  | | Journal (issue) | | England Richard C. Erd U.S. Geological Survey Menlo Park, CA Steven R. Morehead Riverside, CA Donald R. Peacor...........187 by P. B. Moore The origin of faden quartz .................................................wide range of interests, from pyroluminescence in quartz to extensive studies on contact metamorphism in...Schacht (who was bom Horace Greele} Schacht in the USA), President of the German Reichsbank. In du< course...44883 Faden crystals are those which contain a milky, string-like zone passing through them. These crystals |  | | Journal (issue) | | thorium-fueled nuclearreactor is located at Fort St. Vrain, Colorado (Hedrick and Templeton, 1990). This commercial...occur in beach and stream placers, veins, and carbonatites. Large reserves are estimated to occur, In addition...Luck Stone (New Goose Creek) Quarry in Loudoun County, Virginia. The specimens were discovered in a hydrothermal...associated with a white fibrous amphibolite, milky quartz, chlorite, and chalcopyrite. The origin of the...Ervthrite has not ~reviouslvbeen rewrted from Loudoun county. The oniy other reported ¤ces in Virginia |  | | Journal (issue) | | first was severely corroded fluorite in one of the quartz epimorphs from the Bounder End Cross Vein area...with a few from other European countries and the USA. If anyone would like these please let me kno (first...of the Southern Branch gave us a talk titled 'Carbonatites - why the exotic minerals'. Most of us had never...crystallized between 400 and 8oooC. Extrusive carbonatites occur but only one active volcano - 0ldoinyo...Kfeldspar forms in reaction zones around high level carbonatites where country rocks are altered to pure orthoclase |  | | Book | | AFRICA widely in Litchfield County, where good crystals were taken from quartz veins in a variety of metamorphic...Litchfield, where a mass of white quartz on a ridge had once been mined for quartz, and large ilmenite masses...ilmenite crystals to 7 .5 cm in matrix of massive quartz from these dumps-adding that, in his judgment,...region (Brunet, I 977b ). NEW YORK Amity, Orange County. At many isolated collected sites between the towns...have been found with spine! in marble less than 1 mile southwest of Amity (Chamberlain and Robinson, 2013) |  | | Report (issue) | | Pyrochlore-microlite-betafite-bearing carbonatites and alkaline granites 4.1 Carbonatites of Pan African age 4.1.1...1. Marinkas Quelle complex 4.2 Carbonatites and granites of Mesozoic age 4.2.1 Kalkfeld complex 4.2.3...and granite complexes 3.1 Carbonatites of Pan African age 3.2 Carbonatites and granites of Mesozoic-Jurassic...medium-grained wall zone is about 70 cm wide and consists of quartz, feldspar, muscovite and garnet. The discontinuous...the quartz core (Fig. 4). The discontinuous inner intermediate zone ofblocky feldspar and quartz is mainly |  | | Book (edition) | | very old origin, often without lrnown source. e.g. quartz or cinnabar. Current practice most often names...polished mineral surface, expressed in clase. 7 - quartz. 8 - topaz, 9 - corundum, 10 - dia- percentage...abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture), dept...always included in text, except in the cases of the USA, UK, and the provinces Ontario and Quebec in Canada...purine-porphyrine group). a nickel porphyrine. With quartz. rutile, piemontite, sursassite, ardennite, Triclinic |  | | Report (issue) | | East Mojave National Scenic Area, San Bernardino County, California by U.S. Geological Survey 1991 Open-File...Polymetallic vein, polymetallic fault, and gold-silver, quartz-pyrite vein ........ 1 3 0 Known occurrences ....47 mineralized sites designated as gold-silver, quartz-pyrite veins............. 190 ILLUSTRATIONS [Plates...East Mojave National Scenic Area, San Bernardino County, California............................................. 203 12. Spectra of weathered sample of quartz monzonite and of altered samples, including gossan |  | | Report (chapter) | | South Platte District, Colorado · by Wm. B. Simmons and E. Wm. Heinrich Colorado Geological Survey Department...Department of Natural Resources Denver, Colorado I 1980 Front cover: Wide Angle photograph of the Oregon...2~ pegmatite, South Platte pegmatite district, Colorado. This striking example graphically illustrates...base) of nearly-pure quartz projects above the water at the bottom of the pit. The quartz core of the pegmatite...RARE-EARTH PEGMATITE$ OF THE SOUTH PLATTE DISTRICT, COLORADO by Wm. B. Simmons, Jr. Department of Earth Sciences |  | | Journal (issue) | | Cooper Nottingham, England Anthony R. Kampf L.A. County Mus. of Nat. Hist. Los Angeles, CA Joseph A. Mandarino...them a call at 972-540-6999 and order your copy. COLORADO FOSSIL EXPO Denver Merchandise Mart • Mart Plaza...Martin Zinn Expositions • P.O. Box 999 • Evergreen, Colorado 80437-0999 • Fax (303) 674-2384 162 The M ineralogical...occurring in granitic pegmatite and polymetallic quartz vein set tings. It is commonly associated with...Diligent examination of polymetallic hydrothermal quartz veins containing copper, bismuth and vanadium and |  | | Journal (article/letter/editorial) | | most distaldepositsin the district.They consistof quartz-carbonate veinswhichcontaineconomic concentrations...deposits(Park, 1976; (mainlycarbonates) of Paleozoicage and Mesozoic Park and Park, 1979; Park et al.,...minerals(clinopyroxene, CO2 concentrations (8-40 wt %; Park and Park, garnet,epidote,chlorite,and plagioclase), magne-...1953), namedthe "Ogcheonzone" and percent (Park and Park, 1979; Yun et al., 1986). the "Taebaegsan zone...n a singleearly Paleolite-arsenopyrite-bearing quartz veins as they cut zoic rifted basin.They further |  | | Book | | content, it is much less useful. For example pure quartz is colourless, but may be of almost any hue through...usually white and often too hard to powder easily. Quartz has a typical o·ystal form of six-sided prismatic...reflective like diamond Vitreous glassy, as in quartz Resinous like resin, as in amber and opal Pearly...lc Number 6 Mineral Orthoclase 2 Gypsum 7 Quartz 3 Calcite 8 Topaz 4 Fluorite 9 Corundum...conglomerates. The southern shore of Lake Superior (USA) is the best location to find copper , allegedly | | | Book | | content, it is much less useful. For example pure quartz is colourless, but may be of almost any hue through...usually white and often too hard to powder easily. Quartz has a typical o·ystal form of six-sided prismatic...reflective like diamond Vitreous glassy, as in quartz Resinous like resin, as in amber and opal Pearly...Number 1 6 Mineral Orthoclase 2 Gypsum 7 Quartz 3 Calcite 8 Topaz 4 Fluorite 9 Corundum...conglomerates. The southern shore of Lake Superior (USA) is the best location to find copper, allegedly the |
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