 | | Journal (article/letter/editorial) | | IVAN JACOBSON 1714 S. Clarkson Street Denver, Colorado 80210 markivanjacobson@gmail.com No pegmatite... and tourmaline. Even the common minerals of microcline, bladed albite, and smoky quartz are enhanced...5.7 cm, from the Conway Granite, near Red Stone quarry, Conway, Carroll County, New Hampshire. Henry Minot...Parental Granite Pegmatite Class Mineral associates of significance Crystal Peak, Teller and Park counties...counties, CO, USA Crystal ParkâBear Creek, El Paso County, CO, USA Pikes Peak Granite NYF Miarolitic topaz |  | | Journal (article/letter/editorial) | | MOUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO. I. THE GRANITES1 E. B. Gnoss2.q.uoE. Wlr. HnrNnrc:r^...pattern'lvithin the Pikes Peak batholith. segregations consist of small elongate bodies of fayalite granite and porphy'1i1is...porphy'1i1is granite. These igneous bodies are transected by northwest-trending dikes of granite and aplite...fayalite granite are fayalite, fluorite and allanite. Sill-like bodies of Windy Point granite contain...accessories similar to those of the porphyritic granite, namely, fluorite, anatase and pyrrhotite, with |  | | Journal (article/letter/editorial) | | PEGMATITES OF EIGHT MILE PARK, FREMONT COUNTY, COLORADOXT E. Wrrr. HerNnrcu, Department of Mineralogy... Hornblende gabbro. Pikes Peak granite .. . . . Aplite and fine-grained granite . . Diabase Injection...Mile Park pegmatite district, three to twelve miles west of Canon City, Fremont County, Colorado, includes...separate paper. 420 PEGMATITES OF EIGHT MILE PARK, COLORADO 42r area are flanked on the east by hogbacks...major pre-Cambrian rock units are present: Pikes leak granite, Idaho Springs schist, and injection gneiss |  | | Journal (article/letter/editorial) | | the summit of Pika Peak looking northwest acro88 the cliffâs of Glen Cove to South Park and the Tarryall...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 |  | | Report (volume) | | Geology of the Platte Canyon Quadrangle Colorado By WARREN L. PETERSON CONTRIBUTIONS GEOLOGICAL TO...Biotite-muscovite granite..____-__-----------------_----_-___..Pikes Peak Granite-------------------...monzonite----_----___---------------_--_-------_--Granite __ _________________--___-_--___--_-_---______-_-_...quadrangle. _ In pocket FIGURE 1. Index map of Colorado showing location of the Platte Canyon quadrangle...GEOLOGY GEOLOGY OF THE PLATTE CANYON QUADRANGLE, COLORADO By WARREN L. PETERSON ABSTRACT The Platte Canyon |  | | Journal (article/letter/editorial) | | MOUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO. II. PEGMATITESI EuceNB B. Gnoss, CaliJornia Diris...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...accessory assemblage of the Mount Rosa quartz-microcline-riebeckite pegmatites consists chiefly of radioactive...aluminofluorides. These dikes intrude both the Pikes Peak and its derivative fayaiite granites along northeast-trending |  | | Report (issue) | | Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER...Precambrian Crystalline Rocks, Park and Jefferson Counties, Colorado By C. C. HAWLEY and R. A. WOBUS...OF THE SOUTHERN TARRYALL REGION, PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL... Late phases of the final intrusion, the Pikes Peak Granite, were accompanied by beryllium-bearing greisens...rocks, Park and Jefferson Counties. (Geology and ore deposits of the southern Tarryall region, Park and |  | | 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...Mountain area of Colorado have provided numerous attractive specimens of quartz, microcline, albite, and...Unlike the better known pegmatites within the Pikes Peak Batholith, this area is also notable for its |  | | Journal (article/letter/editorial) | | CARBONATITES OF THE ARKANSAS RIVER CANYON, FREMONT COUNTY, COLORADO. 3. THE AMETHYST CARBONATITESl E. Wu. HBrNnrcH...The Amethyst carbonatites in 12 Mile Park, Fremont County, Colorado are the northernmost representatives...exomorphic zones of hematitized and feldspathized granite; 2) calcite barite carbonatite and 3) veins of...Mountain Valley in Fremont and Custer Counties, Colorado (Christman el, al., 1959; Singewaldand Brock,... 1. Index map of Fremont and Custer Counties, Colorado showing location of Amethyst carbonatites. 1a-1b |  | | 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) | | 30 December 2014 GODSEND CLAIM, LAKE GEORGE, COLORADO Figure 1. View of the terrible damage caused...necessary to use such means to retrieve crystals from Pikes Peak pegmatites. Jim Joy photo. Figure 3. A tripod...photo. RAYMOND R. BERRY 7513 Tudor Road Colorado Springs, Colorado 80919 rayber@peoplepc.com Figrtre 5....4314 Woodland Park, Colorado 80866 Raymond R. Berry is an active member of the Colorado Springs Mineralogical...Mineralogical Society and the Colorado Chapter of Friends of Mineralogy. His most recent article for Rocks |  | | Report (issue) | | Basement in Colorado GEOLOGIC A I, Rock Units of the Precambrian Basement in Colorado By OGDEN TWETO...TWETO GEOLOGY OF THE PRECAMBRIAN BASEMENT IN COLORADO U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 1321-A...igneous rocks in outcrop and the buried basement in Colorado UNITED STATES GOVERNMENT PRINTING OFFICE...1912-1983 Rock units of the Precambrian basement in Colorado. (Geological Survey Professional Paper ; 1321-A)...Geology, Stratigraphic Pre-Cambrian. 2. Geology Colorado. QE653.T9 1986 551.7'1'09788 I. Title. For sale |  | | Journal (issue) | | England Richard C. Erd U.S. Geological Survey Menlo Park, CA Donald R. Peacor University of Michigan Ann...R. Kampf Natural History Museum of Los Angeles County George Robinson National Museums of Canada Arthur..............................203 R. Barnes Pikes Peak Granite......................................217...SPECIMENS from the collection of the Geology Museum, Colorado School of Mines. See page 242 for a full description... All rights reserved. notes fromthej EDITOR COLORADO-III Here we are with our third special issue devoted |  | | 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."...(1883) as having been found "in the disintegrated granite on one of the steep slopes about 4 miles from Manitou...been in the Crystal Park area. The largest fine-quality topaz specimens in Colorado occur in several separate |  | | Report (issue) | | COPY Bedrock Geology of the Kassler Quadrangle Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 421-B Bedrock... Bedrock Geology of the Kassler Quadrangle Colorado By GLENN R. SCOTT GEOLOGY OF THE KASSLER QUA.DRANGLE...DRANGLE, JEFFERSON AND DOUGLAS COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL PAPER 421-B A survey...survey of the east flank of the Colorado Front Range with emphasis on Cretaceous rocks and on structural...rocks_____________ Granite gneiss and migmatite_ _ _ _________ Sillimanite granite gneiss_________________ |  | | Journal (issue) | | Microminerals from Pegmatites in the Pikes Peak Batholith, Central Colorado Daniel E. Kile Research Associate...Nature & Science 5176 Black Bear Run - Littleton, Colorado 801215 Email: centennial87@comcast.net were sparse...number of localities throughout the Pikes Peak batholith in central Colorado, and many of them provide spectacular...found in pegmatites in the Pikes Peak batholith (PPB) in central Colorado. Although some minerals, such...samples An overview of weathered Pikes Peak Granite within the Pikes Peak batholith, in an area north of |  | | Journal (issue) | | Gem & Mineral Club News June 2019 Now retired to Colorado, Dr. Carnein was an active member of NMS when...grained groundmass). For example, a porphyritic granite might contain plagioclase crystals that are 2 cm...occur at the Devils Hole mine, in Fremont County, Colorado). More typically, they are on the order of...Such rocks have a porphyritic Figure 4. Typical granite pegmatite with accessory schorl (black), muscovite...garnet (dark brown). Devils Hole mine, Fremont County, Colorado. (Carnein photo and collection) page 4 |  | Gagnon, J. E., Samson, I. M., Fryer, B. J., Williams-Jones, A. E. (2004) THE COMPOSITION AND ORIGIN OF HYDROTHERMAL FLUIDS IN A NYF-TYPE GRANITIC PEGMATITE, SOUTH PLATTE DISTRICT, COLORADO: EVIDENCE FROM LA ICP MS ANALYSIS OF FLUORITE-AND QUARTZ-HOSTED FLUID INCLUSIONS. The Canadian Mineralogist, 42 (5) 1331-1355 doi:10.2113/gscanmin.42.5.1331 | Journal (article/letter/editorial) | | NYF-TYPE GRANITIC PEGMATITE, SOUTH PLATTE DISTRICT, COLORADO: EVIDENCE FROM LAâICPâMS ANALYSIS OF FLUORITEAND...(NYF-type) hosted by the Proterozoic Pikes Peak granite in north-central Colorado. The mineralization comprises...core-margin zone fluorite and wall-zone quartz and microcline perthite. Primary fluid inclusions in hydrothermal...of an F-bearing hydrothermal fluid. Keywords: granite, NYF-type pegmatite, rare-earth elements, quartz...fluidârock reaction, model, South Platte District, Colorado. SOMMAIRE Nous avons Ă©tudiĂ© un exemple de minĂ©ralisation |  | | Report (issue) | | Badger Flats) Beryllium Area, Park and Jefferson t:-1 Counties, Colorado g ~ s:p ~ I> li:tl ~ GEOLOGICAL...(or Badger Flats) Beryllium Area, Park and Jefferson Counties, Colorado By C. C. HAWLEY GEOLOGY AND ORE...OF THE SOUTHERN TARRYALL REGION PARK AND JEFFERSON COUNTIES, COLORADO GEOLOGICAL SURVEY PROFESSIONAL...association with the late Precambrian Redskin Granite UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON...______________ _ Silver Plume(?) Granite ____________________ _ Pikes Peak Granite and associated rocks _____ |  | | 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) | | N{OUNT ROSA AREA, EL PASO AND TELLER COUNTIES, COLORADO III. LANIPROPHYRES AND MINERAL DEPOSITS1 E. B...syenites and sodic diorites. They intrude Pikes Peak granite, its variants, and Mount Rosa-type pegmatites...Strongly radioactive altered zones in Mount Rosa granite contain uranothorite and thorogummite, which also...the Mount Rosa area, El Paso and Teller Counties,Colorado,we report the results of studies on nearly 50...Beaver Creek, Teller County. One-half mile southeast of Kineo Mtn., El paso County. Near trail, North Cheyenne |  | | Journal (article/letter/editorial) | | CAVITY IN CHEYENNE CANYON, EL PASO COUNTY, COLORADO GARY ZITO Colorado School of Mines, Metallurgical and...Engineering Department, 1500 Illinois St., Golden, Colorado 80401, U.S.A. SARAH L. HANSON§ Adrian College...in a pegmatite in Cheyenne Canyon, El Paso Co., Colorado has an unusual mineral assemblage that includes...danalite cores. The cavity was lined with white microcline crystals with clear epitaxial albite overgrowths...pegmatite pocket in Cheyenne Canyon, El Paso County, Colorado. This location is about 2 km north of the |  | | Journal (article/letter/editorial) | | Figure 4. Microcline and quartz, 9.9 cm across, Tree Root Pocket, Two Point claim, Pikes Peak batholith...batholith, Teller County. The Collectorâs Edge specimen, Jeff Scovil photo. PETER J. MODRESKI U.S. Geological...Mail Stop 150, Box 25046 Federal Center Denver, Colorado 80225 pmodreski@usgs.gov C olorado is, of course...been written as guides to mineral collecting in Colorado. A classic, which went through three major editions...1951 version with a slightly different title), is Colorado Gem Trails and Mineral Guide, by Pearl (1951, |  | | Journal (article/letter/editorial) | | Crystal Peak area, north of Lake George, Colorado. The claim itself is in Teller County near the Park County...The Rocket mine is within the Pikes Peak batholith, a Precambrian granite between 1.03 billion and 1.05...(Hutchinson 1976). The pegmatites that intrude into the granite are classified as simple pegmatites, unlike the...believed to be slightly younger than the surrounding granite and are far tougher and less eroded. Pockets are...intrusions, at the contact between the soft, decomposed granite and the coarser-grained pegmatites. At the Rocket |  | | 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 |
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Pikes Peak Granite, Park County, Colorado, USA