 | | Journal (article/letter/editorial) | | northwest acro88 the cliff’s of Glen Cove to South Park and the Tarryall Mountains. Researchers have subdivided...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...subduction zone and possibly the creation Era in Colorado and Wyoming of a volcanic island arc. Carpenter |  | | 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) | | Vol. 20 SOCIETY OF' AMERICA MAY, 1935 No.5 COLORADO PEGMATITES KBNNBTU K. Lauons, Unioersity of Kansas...in every county 'of Colorado along the Front Range of the Rocky Mountains from Larimer County on the Wyoming...Wyoming line to Custer County in the south-centralpart of the state, and in scatteredpre-Cambrianareas...The pre-Cambrian schists and granites of Larimer County are cut by numerous pegmatite dikesl which have...exhibiting an ore mineral phaseoccur in Boulder County.3JeffersonCounty contains both tourmaline and muscovite |  | | Journal (issue) | | Jean COWMAN & Philip PERSSON Tribute Pocket, CO, USA Mineral photography: James Elliott INTRODUCTION...freshly mined topaz crystal from the Tribute Pocket, Agnus Dei claim, Colorado, USA. HISTORY: DISCOVERY...this mine. Associated Photographer: Jeff Scovil (USA) Topaz is a rather common mineral, forming during...of Cameron Cone, in the south-eastern portion of the Pikes Peak massif, El Paso County, Colorado, was... INTRODUCTION Associated Editors: Paul Cragan (USA) Malcolm Southwood (Australia) P. Persson photo |  | | Journal (issue) | | I. Jacobson, Denver, CO Anthony R. Kampf, l.A. County Museum of Natural History, CA Virgil W. Lueth,...across a local area net\,vork. Subscription offices: USA/North America: Taylor & Francis Group, LLC, 530 Walnut...Copyright Clearance Center (www.copyright.com) in the USA or the Copyright Licensing Agency (www. cla.co.uk)...Brazil: At the Natural History Museum of Los Angeles County, Carl A. Francis and Aaron Celestian 89 Who's...Signature specimen, p. 86 ABOUT THE COVER: Topaz with lepidolite, a/bite (c/eavelandite), and microc/ine, 72.5 |  | | 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...PEARL Exploring Rocks, Minerals, Fossils in Colorado America's Mountain: Pikes Peak and the Pikes Peak |  | | Book (edition) | | — _ ; COLORADO GEM TRAILS AND MINERAL GUIDE ! ■ : ' BOOKS BY RICHARD M. PEARL Colorado Gem Trails...Trails and Mineral Guide Colorado Rocks, Minerals, Fossils America’s Mountain: Pikes Peak and the Pikes...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 ★ COLORADO GEM TRAILS AND MINERAL GUIDE ★ SKETCH MAPS BY MIGNON WARDELL PEARL |  | | Journal (issue) | | ticket to the booming silver-rush town ofLeadville, Colorado. Eventually rnoving on through New Mexico and...put in the ground brought to the surface a huge crystal of gadolinite, and for a short time I enjoyed the...most pleasant excitement, bringing out crystal after crystal from the decomposed feldspar, until the...celestine crystal groups found at various sites in the Gien Rose Limestone formation of Lampasas County. Lampasas...George F. Kunz described a sky-blue celestine crystal measuring 10 X 13 X 20 cm found in a railroad cut |  | | 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 |  | | Journal (article/letter/editorial) | | Two Point claim, Pikes Peak batholith, Teller County. The Collector’s Edge specimen, Jeff Scovil photo...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,...up-to-date guidebook to the state’s minerals is Colorado Rockhounding, by Voynick (1994). Other published |  | | 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 |  | | Book (volume) | | ...........................................59 Colorado ...............................................................548 Table of Maps Page Alabama County Map ...................................................................................4 Alaska County and Stream Map ......................................................................22 Arizona County Map ................................................................................49 Arkansas County Map .......................................... |  | | Journal (issue) | | - - - - - - - - - - - Mineral Collections 1n Colorado A Supplement to The Mineralogical Record November-December..."Smithsonian packet," Smoky Hawk claim, Florissant, Colorado. Collected in 2008; Dorris Family collection;...certificates for mines in the Cripple Creek District, Colorado, in 1898 and 1901. Sponsorship: This special supplement...Collecting in Colorado The Collections: Mel & Pam Bersch Ryan Bowling Ralph Clark Colorado School of Mines...Thompson George Witters Martin Zinn III and Colorado in the :Mineralogical Record Supplement to The |  | | Book (volume) | | ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |  | | Book (volume) | | ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |  | | Journal (issue) | | England Richard C. Erd U.S. Geological Survey Menlo Park, CA Steven R. Morehead Riverside, CA Donald R. Peacor...Menzies Pink topaz from the Thomas Range, Juab County, U ta h .........................................check out this new way of selecting purchases. Crystal Models Anyone who has ever tried to study crystallography...that the process is much easier if you have goo crystal models to play with. Rene Just Haiiy (1743-1822)...collectibles today. Among the more recent producers of crystal model sets was tl German mineralogist Paul Heinrich |  | | 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 |  | | Book (edition) | | describes sites under of the nearest town and county. and the many maps included book contain such...test samples in the field for color, hardness, crystal formation, transparency, and other distinguishing...Diamond M Tourmaline ^P Ruby. Sapphire O Quartz crystal ^J^ Garnet __ Azurite, Malachite, Chrysocolla...in rock and being the first to see a sparkling crystal fresh from nature's hand. And the gem hunter gains...clues toid garnet are these: 1. Hardness. 2. Crystal structure 3. Cleavage — — the innate shape |  | | 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) | | 56 ct), Sweet Home Mine, Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...Ellis, [D; Jeannette B. Carillo, Gem Center USA, EI Paso, TX; Gary Christopher, The Prospectors Cache...James D. Lindberg, Las Cruces, NM; Jack Lowell, Colorado Gem & Mineral Co., Tempe, AZ; Steven & Lorna Lukinuk...Resources, Vancouver, BC; Barbara L. Muntyan, Ouray County Historical Society, Ouray, CO; Merrill O. Murphy |  | | Report (issue) | | correct results. U.S. Geological Survey, Denver, Colorado 80225 Table of Contents Table of Contents Introduction...Lepidocrosite GDS80 (Sy) Lepidolite HS167.3B Lepidolite Lepidolite Lepidolite Lepidolite NMNH105538 NMNH105543...Area 5 #15 Topaz Wigwam Area 6 #16 Topaz Harris Park #17 Topaz Crystal_Park_#2 Topaz Jos_#22 Topaz Harris_Park...Topaz Cameron Cone #42 Topaz Mt . Antero #5 Topaz Glen Cove #6 Topaz Glen Cove #8 Topaz Harris Park #9 Topaz |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state... test samples in the field for/ hardness, crystal formation," (continued on back flap) r 1° *o...M Tourmaline fQl Ruby, O Sapphire Quartz crystal 'y^ Garnet — Azu rite, Malachite, Chrysocolla...Maryland; Professor Richard Pearl of Colorado Springs, Colorado; and Professor Jack Hanahan of Belmont...in rock and being the first to see a sparkling crystal fresh from na- Furthermore, the gem hunter gains | | | Book (volume) | | rhoColorado; eolorless scheelite (19.66 cc), Kern Cowny, California;...Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...Ellis, ID; Jeannette B. Carillo, Gen1 Center USA, El Paso, TX; Gary Christopher, The Prospectors Cache...James D. Lindberg, Las Cruces, NM; Jack Lowell, Colorado Ge1n & Mineral Co., Tempe, AZ; Steven & Lorna...Resources, Vancouver, BC; Barbara L. Muntyan, Ouray County Historical Society, Ouray, CO; Merrill 0. Murphy |  | | Book | | HfiRIN COUNTY FREE LIBRfiRY 311110G386652Q I V Russell P MacFal A COLOR TREASUF FOR COLLECTORS...gems and the science of crystallography— the six crystal systems and their characteristics. The actual tests...to Hunting Locations ? i 9 GIVEN TO THE MARIN COUNTY LIBRARY BY MARI N L MTNF.RAT. SOCTETY DAVID...Formations Compact and Special Forms Druses and Crystal Amorphous Forms VII 4 PHASES OF ROCK COLLECTING...SYMMETRY OF CRYSTALS Nature of a Crystal tems 16 I The Six Crystal Systems I Characteristic of the |  | | Book | | vugs of crystalline talc. Easily the best extant crystal, a doubly terminated floater found in a talc vug...long (Marty, 2004 ). AFRICA widely in Litchfield County, where good crystals were taken from quartz veins...region (Brunet, I 977b ). NEW YORK Amity, Orange County. At many isolated collected sites between the towns...Litchfield County. Ilmenite masses and crystals from somewhere near Washington, Litchfield County, were described...Hastings County. In fall 1994, Dan and Shelley Lambert extracted excellent loose ilmenite crystal clusters |
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