 | | Journal (article/letter/editorial) | | December 2012 Flgun 1. View from the summit of Pika Peak looking northwest acro88 the cliffâs of Glen Cove...northeasterly-trending continentul Figure 2. Geologic map of the Colorado Front Range showing the Precambrian metamorphic...I-billion-year-old formbasin was established in the southeril Pikes Peak Batholith. Adapted by the author from Reed, Bickford...Karistrom 1978; Lanthier 1978). Farther south in Colorado, sediments accumulated in decper-water rocks formed...Survey into âEarly, Middle, and Lateâ 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. I. THE GRANITES1 E. B. Gnoss2.q...occurring in an arc like pattern'lvithin the Pikes Peak batholith. segregations consist of small elongate...fluorite, anatase and pyrrhotite, with lesser monazite and bastnaesite. The Mount Rosa body, an alkalic...and less than 150 feet thick, intrusive into Pikes Peak. Finer grained dikelike variants of the Mount...Mount l{osa granite include xenoliths of Pikes Peak granite. The Mount Rosa granite contains accessory astrophyllite |  | | Journal (article/letter/editorial) | | MINERALOGY OF THE MOUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO. II. PEGMATITESI EuceNB B. Gnoss...the Pikes Peak granite and in related alkalic granites in the Mount Rosa area, west of Colorado Springs...Springs. One is the older calc-alkalic Pikes Peak type; the younger is the alkalic Mount Rosa type. The accessory...aluminofluorides. These dikes intrude both the Pikes Peak and its derivative fayaiite granites along northeast-trending...pegmatites contrast markedly with the coexisting Pikes Peak pegmatites, which are characterized by quartz |  | | Journal (article/letter/editorial) | | 20:04 16 May 2014 Stove Mountain Area Colorado Springs, Colorado All photos by Gary Zito unless otherwise...otherwise noted 224 ROCKS & MINERALS GARY ZITO Colorado School of Mines Metallurgical and Materials Engineering...Engineering Department 1500 Illinois Street Golden, Colorado 80401 gzito@mines.edu SARAH L. HANSON Adrian...20:04 16 May 2014 in the Stove Mountain area of Colorado have provided numerous attractive specimens of...Unlike the better known pegmatites within the Pikes Peak Batholith, this area is also notable for its |  | | Journal (article/letter/editorial) | | IVAN JACOBSON 1714 S. Clarkson Street Denver, Colorado 80210 markivanjacobson@gmail.com No pegmatite...Granite, near Red Stone quarry, Conway, Carroll County, New Hampshire. Henry Minot specimen and photo...Crystal Peak, Teller and Park counties, CO, USA Crystal ParkâBear Creek, El Paso County, CO, USA Pikes...NYF Miarolitic topaz, amazonite, phenakite Pikes Peak Granite NYF Miarolitic topaz, amazonite, phenakite... 3 Mount Antero and Mount White, Chaffee County, CO, USA Mount Antero Granite NYF Miarolitic beryl |  | | Journal (issue) | | Julius Weber Mamaroneck, New York COLORADO ISSUE #2 Articles Colorado locality index.............................. 323 by B. L. Muntyan Whatâs new in Colorado minerals? ......................................of Colorado ..................................349 by J. A. Murphy Amazonite from the Pikes Peak batholith...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 |  | | Report (issue) | | Z=4 X-ray Powder Pattern: St. Peters Dome, Colorado, USA. 2.858 (10), 1.746 (8), 1.489 (8), 2.468 (6)...[98.98] [99.88] 100.5 (1) St. Peters Dome, Colorado, USA; by XRF, flame photometry, electron microprobe...subjected to alkali metasomatism (St. Peters Dome, Colorado, USA); in pegmatite in a differentiated alkalic massif...zincian davidite (St. Peters Dome, Colorado, USA); landauite, rutile, monazite, bastnaÌsite, brookite (Burpala...the St. Peters Dome area, near Pikes Peak, El Paso Co., Colorado, USA. In the Burpala massif, 120 km |  | | Journal (article/letter/editorial) | | MINERAL PEGMATITES OF CHAFFEE AND FREMONT COUNTIES, COLORADO* E. Wu. HuNnrcn, Universityof Michigan,Ann Arbor...of pegmatites in Chaffee and Fremont Counties, Colorado, is characterized by the association of fluorite...fluorite with the rare earth minerals, euxenite, monazite, allanite, and gadolinite. The deposits, which are...mineral pegmatites in Chaffee and Fremont Counties, Colorado, and to compare the group with other pegmatite...1946 while engagedin field work in south-central Colorado. A part of the field expenseswas met by a generousgrant |  | | Journal (issue) | | Colorado Springs Mineralogical Society Founded in 1936 July 2015 PICK&PACK Vol 55 ...... Number 6 Inside...Jacobson Topic: Pegmatitic Rare-earth Minerals of Colorado: Species and Identification Refreshments provided...the Faceting Group CSMS Calendar Pg 2 Crystal Peak Gem Co Pg 4 Gravel Pit Pg 6 New Fossil Laws...Friends of Mineralogy, Colorado Chapter. Mark has collected rare earth minerals in Colorado, Texas, Wyoming...Minerals of Colorado: Species and Identification Most of the pegmatitic rare-earth minerals in Colorado are found |  | | Journal (article/letter/editorial) | | FLUOCERITEAND ASSOCIATED CLOUDPEGMATITE,TELLER COUNTY,COLORADOX E. Wrt. HBrNnrcn AND EuGENEB. Gnoss,...Highway 24, 2.3 miles west of Divide in Teller County, Colorado, was studied in June 1957and June 1958.Laboratory...of the pegmatitesof the South Platte-Pikes Peak area of Colorado, to which field work during the last...n n a i s sancestudy of rare-earthpegmatitesin Colorado(Heinrich, 1948). The lensoidpegmatite, well exposedin...generally steeply dipping to vertical contacts with Pikes Peak granite. It is nearly 350 feet long, and at its |  | | Journal (article/letter/editorial) | | in West Cheyenne Canyon, El Paso County, Colorado, is located in the Pikes Peak batholith, a composite...composite of the Pikes Peak Granite and a series of late-stage potassic and sodic granite plutons (Raines 2001;...crystals. Other genthelvite localities in the Pikes Peak batholith are Crystal Park, Cookstove Mountain...Dunn (1977). In the Northern Cascades of Okanogan County, Washington, the alkaline granites of the Golden...described in 1892 from West Cheyenne Canyon, El Paso County, Colorado, by Frederick August Genth (1820â1893) |  | | Journal (article/letter/editorial) | | 2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Sarah L. HANSON Geology Department, Adrian College... 110 S. Madison Street, Adrian, Michigan 49221, USA Alexander U. FALSTER and Karen L.WEBBER Department...2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Abstract Pegmatites enriched in the rare-earth elements...along a southwestern trend from Wisconsin through Colorado to Arizona. Four widely geographically spaced...South Platte (SP), in Colorado, circa 1.6 Ga Trout Creek Pass (TCP), also in Colorado, and circa 1.5 Ga Mojave |  | | Journal (article/letter/editorial) | | 04:13 19 December 2014 Mount Antero, Chaffee County, Colorado A s virtually every collector knows, many...and some districts, such as those in San Diego County, California, and many of those in Minas Gerais...aquamarine localities, Mount Antero, Chaffee County, Colorado, was highlighted by Jacobson and Lees (2008)... at Waterford, Oxford County; and the Square pit at Topsham, Sagadahoc County, Maine. Good crystals are...North Chatham, Carroll County, and the Sugarloaf Mountain area, Grafton County, New Hampshire. Other New |  | | Report (issue) | | Bill Bryan claim, guild Steer Canyon, Montrose County, Colo, Ref. no. cf X-rav patterns TE 474 Quantity...Arc!ers(, nitc. 1/ usrm Hillside mine, Yac;apal County, Ariz, Ref. no. of X-ray patterns Inv. 2791 Quantity...Location La4fl7J:Tite Hillside mine, Yavapai County, Ariz. Inv. 2777 Quantity now m,tal- ayleyite...Location 1 :.!ta-bayleyite ? Hillside mine Yavapai County, Ariz. Ref. no. of X-ray patterns Inv. 4004 (â1...betafite N:ineral and identifying number Location El=s-._ranriite Fetafo, USNM 92(-:76 Madagascar |  | | Journal (article/letter/editorial) | | 09:35 10 October 2014 Helen Hunt Falls, El Paso County, Colorado O wing to its diverse paragenesis and...zircon localities is quite long. The Pikes Peak region of Colorado has been a historical source of exceptional...zircon crystals from Helen Hunt Falls, El Paso County, Colorado. Dave Bunk specimen, Jeff Scovil photo...quartz specimen from Helen Hunt Falls, El Paso County, Colorado. Dave Bunk specimen, John Smolski photo...syenite in the Litchfield-Gardiner area, Kennebec County (King and Foord 1994). Zircon crystals to 2.5 cm |  | | Report (issue) | | 100.00 81.46 (1) Tuolumne River, California, USA; recalculated to 100.00% from original total of 97...detrital mineral in sediments. Association: Zircon, monazite, gadolinite, fergusonite, uraninite, yttrialite...Ambatofotsy, Androtsabo, Befaritra, and elsewhere. In the USA, from the Baringer Hill pegmatite, 26 km west of...Peters Dome, near Pikes Peak, El Paso Co., and the Powderhorn district, Gunnison Co., Colorado; from the Wet...Wet Mountains, Custer Co., Colorado. In Canada, as large but crude crystals from the McDonald mine, Hybla |  | | Journal (article/letter/editorial) | | Granite- a rare-metal-rich Precambrian pluton, Colorado, USA G. A. DESBOROUGH, S. D. LUDINGTON, AND W. N...N. SHARP US Geological Survey, Denver, Colorado, USA SUMMARY. The Precambrian Redskin stock is a highsilica...forms a late pluton related to the looo Ma-old Pikes Peak batholith. Zircon, fluorite, fluocerite, ilmenorutile...the most abundant accessory minerals. Thorite, monazite, and xenotime are sparse, and cassiterite and...igneous rocks which are hosts for molybdenite ore in Colorado (Desborough and Sharp, I978; Desborough et al |  | | 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) | | quartz, Manhan River mine, Easthampton, Hampshire County, Massachusetts. Marvin Rausch specimen, Jeff Scovil...branch of the Calumet and Hecla mine, Houghton County, Michigan. A. E. Seaman Mineral Museum (Michigan...JulyIAugust: Vanadinite and wulfenite, Old Yuma mine, Pima County, Arizona. Les Presmyk specimen, Jeff Scovil photo...claim, Lake George intrusive center, Teller County, Colorado. Dave Bunk specimen, Jeff Scovil photo. November/December:... Eagle mine, Gilman County, Colorado. Dave Bunk specimen on loan to the Colorado School of Mines, Jeff |  | | Book (edition) | | MILEAGE L OGS. REVISED EDITION Revised Edition, COLORADO GEM TRAILS AND MINERAL GUIDE HICllAHD :--1. PEARL...an extensive „em and mineral collecting tour 01 Colorado, revealing the interesting places where Nature...highways. Latest information is given on local tra\'el and collecting conditions and land ownership, so...Swallow, Publisher) 2679 South York Street Denver, Colorado 80210 - , =· - ·, BOOKS BY RICHARD M. PEARL...Minerals, Fossils in Colorado America's Mountain: Pikes Peak and the Pikes Peak Region Seven Keys to |  | Lehmann, Bernd, Nakai, Shun'ichi, Höhndorf, Axel, Brinckmann, Jörn, Dulski, Peter, Hein, Ulrich F, Masuda, Akimasa (1994) REE mineralization at Gakara, Burundi: Evidence for anomalous upper mantle in the western Rift Valley. Geochimica et Cosmochimica Acta, 58 (2) 985-992 doi:10.1016/0016-7037(94)90520-7 | Journal (article/letter/editorial) | | Copyright D 1994 ElsevierScienceLtd Printed in the USA. All rights reserved Petgamon ~16-7037/94$6.~ +...outgrowth of expl&ation work on the bastnaesite-monazite ore deposits of Gakara in Burundi (in the literature...metasomatically transformed into microcrystalline monazite ( LREE-P04). Accompanying primary mineral phases...samples are from an area with small bastnaesite-monazite veinlets and have a disturbed Rb-Sr isotope system...the fact that REE patterns of bastnaesite and monazite reflect their geologic environment of formation |  | | Journal (article/letter/editorial) | | Cornwall, England (Davidson, 1930), Leadville, Colorado (Laughlin and Behre, 1934) and the Cordillera...writer (1948) in the Eight Mile Park district of Colorado. Emmons (1940, pp. 23-24) related the zoning to...lepidolite, columbitetantalite, euxenite, polycrase, monazite, xenotime, lithiophilite, molybdenite, bismuth...HEINRICH amblygonite, topaz, beryl, apatite, monazite, lithium phosphates, columbite-tantalite, uraninite...chrysoberyl, triplite, triphylite, lithiophilite, monazite, zircon, columbite, samarskite, microlite, uraninite |  | | Book (edition) | | â _ ; COLORADO GEM TRAILS AND MINERAL GUIDE ! â : ' BOOKS BY RICHARD M. PEARL Colorado Gem Trails...Mineral Guide Colorado Rocks, Minerals, Fossils Americaâs Mountain: Pikes Peak and the Pikes Peak Region American...Nature As Sculptor: A Geologic Interpretation of Colorado Scenery Guide to Geologic Literature Popular Gemology...Gemology Mineral Collectors Handbook Colorado Gem Trails The Art of Gem Cutting (With Dr. H. C. Dake)...Dake) * RICHARD M. PEARL â
COLORADO GEM TRAILS AND MINERAL GUIDE â
SKETCH MAPS BY MIGNON WARDELL PEARL |  | | Report (chapter) | | South Platte District, Colorado · by Wm. B. Simmons and E. Wm. Heinrich Colorado Geological Survey Department...Department of Natural Resources Denver, Colorado I 1980 Front cover: Wide Angle photograph of the Oregon...2~ pegmatite, South Platte pegmatite district, Colorado. This striking example graphically illustrates...RARE-EARTH PEGMATITE$ OF THE SOUTH PLATTE DISTRICT, COLORADO by Wm. B. Simmons, Jr. Department of Earth Sciences...Michigan Ann Arbor, Michigan 48109 CGS LIBRARY Colorado Geological Survey Department of Natural Resources |  | | Journal (article/letter/editorial) | | PLUTON OF THE WAUSAU SYENITE COMPLEX, MARATHON COUNTY, WISCONSIN Alexander U. FALSTER§ Department of...Wausau syenite complex, exposed in central Marathon County, Wisconsin, is an A1-type within-plate granitoid...fluorine-enriched), located in central Marathon County, Wisconsin (Fig. 1), forms part of a NEâSW-trending...Pegmatites are rich in REE-bearing species such as monazite-group minerals, xenotime-(Y), bastnĂ€site-group... 2012). However, the South Platte pegmatites (Colorado) exhibit an astonishing REE concentration in the |
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