 | | Journal (article/letter/editorial) | | Texas mineral locality INDEX Whereas Texas is well known for its vastness, cattle industry, and oil...I T S T O P O G R A P H Y A N D G E O L O G Y , Texas, the second largest state, has produced relatively...famous localities. A s this article will show, Texas has hadâor currently hasânu merous mineral occurrences...produce good specimens; yet when specimens from Texas are sought in collections and dealers' stocks, few...some basic facts that help explain the situation. Texas has very little federal land in its mineralized |  | | Report (issue) | | Austin Austin, Texas 78712 JOHN T. LONSDALE, Director Report of Investigations â No. 42 Texas Gemstones...OFECONOMIC GEOLOGY The University of Texas at Austin Austin, Texas 78712 JOHN T. LONSDALE, Director â...â No. 42 Report of Investigations Texas Gemstones By Elbert A. King, Jr. February 1961 â â â Second...gemstones Cabochon gems Faceted gems Tumbled gems Texas gemstones Amber Augite Beryl Celestite Diamond Epidote...Fossil wood Gadolinite Garnet Jet Labradorite Microcline Obsidian Opal _ Pearl Quartz Chalcedony Sanidine |  | | Journal (article/letter/editorial) | | Geochronologic and Isotopic Studies, Llano Uplift, Central Texas James R. Garrison, Jr., Leon E. Long, and Debra...of GeologicalSciences,Universityof Texas, Austin, Texas 78712, USA Abstract. Two major episodes are evident...Precambrian basement of the Llano Uplift, central Texas. Dynamothermal metamorphism was accompanied by minor...Bureau of Economic Geology,Universityof Texas, Austin, TX 78712, USA the eastern Llano Uplift. A metasedimentary...area. Introduction The Llano Uplift, Central Texas, is a gentle structural dome in which erosion has |  | | Journal (article/letter/editorial) | | BRAUNITE FROM SNOWMASS.PITKIN COUNTY. COLORADO; AusrrN F. Rocnns,Stanford,Unitersity,Cal,ifornia. Alsrnacr...country, is recorded from a new locality in Pitkin County, Colorado. It is a massive, somewhat granular,...manganophyll (manganian biotite)], muscovite, quartz, microcline, and plagioclase. The three latter and probably...Ark. (2); Mason County, Tex. (3); Iron County, Mo. (4); Shannon County, Mo. (a); Humboldt County, Calif...Plumas County, Calif. (5), Stanislaus County, Calif. (6), Bisbee, Ariz. (6), Aroostook County, Me. (6) |  | | Journal (article/letter/editorial) | | THE ROCKS OF TEXAS â T h e Southwest G e m by M R S . P E A R L G A R R I S O N Downloaded by [University...classifica tions of gems presently occurring i n Texas, and i f you count the crystalline varieties of...right, 36 varieties of gem rocks can be found in Texas. Let's take them alphabetically: AMBERâa rich brown...ceous coal, and i n Terlingua Creek in Brewster County. T h e amber found in the G u l f Coastal Plain...quality. AUGITEâoccurs near Eagle Flat, Hudspeth County, in dark greenish-brown resembling obsidian, weathering |  | | Journal (article/letter/editorial) | | PATTERNS IN THE GRANITES OF THE LLANO-BURNET REGION, TEXAS BY DAVID K E P P E L CONTENTS Abstract..........granites in the Llano-Burnet uplift of central Texas have been studied with special attention to structure...INTRODUCTION The Llano-Burnet uplift of central Texas exposes a large area of preCambrian gneiss and schist...with Drs. V. E. Barnes and H. B. Stenzel of the Texas Bureau of Economic Geology has contributed greatly...10.8 6.8 4.3 3.4 3.9 5.4 5.6 1.9 Per cent of microcline 20 43 7 41 Average grain size (mm.) 2 7 6 0.5 |  | | Journal (article/letter/editorial) | | Uplift' Texas Jluns R. Gnnntsotq, Jn.1 Department of Geological Sciences The Uniuersity of Texas at Austin...Austin. Texas 78712 Abatract The 1.0-1.2 b.y. old rocks of the southeastern Llano Uplift, Texas include...magnetite. Introduction The Llano Uplift, Central Texas, is a gentle structural dome in which erosion has...Branch Gneiss commonly contains inclusions of the of Texas at Austin using the standard PacksaddleSchist.Within...Mineralogically, the Red PetrograPhY Mountain Gneissis a microcline granite containing minor biotite and muscovite |  | | Journal (article/letter/editorial) | | BRAUNITE FROM MASON COUNTY, TEXAS* Suraey' D. F. Hnwnrr ANDW. T. Scuallnn, U' S.Geol,ogicol The Spiller...manganese mine, 15 miles northeast of Mason, Mason County, Texas, was hastily examined by one of the authors...is quartzite, which in places contains enough microcline to be regarded as a gneiss.It is a part of the...Adkins, W. S., and Plummer, F. B', The geology of Texas, vol' 1, Stratigraphy: Unin. TexasBull.3232, pp |  | | Report (issue) | | „ TEXAS ROCKS AND \ r - An Amateurâs Guide ;s ROSELLE M. GIRARD A b OF ECONOMIC GEOLOGY V N IVERSITY...The University of Texas Austin, Texas Peter T. Flawn, Director Guidebook 6 TEXAS ROCKS AND MINERALS...Rock identification charts Descriptions of some Texas rocks and minerals Anhydrite .....................Composition, hardness, and specific gravity of some Texas minerals Pace 25 26 39 40 43 43 43 44 45 46 47...81 84 85 85 87 87 88 89 90 93 94 94 95 97 99 Texas Rocks and Minerals Books about rocks and minerals |  | | Journal (article/letter/editorial) | | occur most frequently in common pegmatite with microcline and orthoclase as the chief feldspars present...Lode pegmatite near the Royal Gorge in Fremont County, Colorado. Common in the pegmatites of Yavapai...Mountain in the Crested Butte region of Gunnison County, Colorado, in good gem crystals. ANDRADITE, calcium-iron...Andradite has been found at Middletown, Delaware County, Pennsylvania and at other localities in Delaware...in Maine, New Hampshire, Connecticut, New York, Texas and other states Large masses were formerly obtained |  | | Report (volume) | | MINERAL RESOURCES OF THE LLANO-BURNET REGION, TEXAS WITH AN ACCOUNT OF THE PRE-CAMBRIAN GEOLOGY BY... ILLUSTRATIONS. Page. PLATE I. Geologic map of Texas............................................ 7 II...showing locations of Burnet and Llano quadrangles, Texas...................................... 8 III. Economic...Economic and geologic map of I/lano quadrangle, Texas........ In pocket IV. A, Assimilation of schist fragment...Silurian Cambrian and Ordovician GEOLOGIC MAP OF TEXAS. See page 7. Undifferentiated Algonkian Tertiary |  | | Book | | milky quartz stems. Denny Mountain area of King County. Specimen from the collection of Cary A. Maykut...DESCRIPTIONS 21 ABBREVIATIONS 24 GLOSSARY 25 COUNTY INDEX OF MINERAL OCCURRENCES 29 MINERAL DESCRIPTIONS...(using a code explained on page 21) and a county by county list mentioning the nature of their occurrence...Parks and Monuments prohibit all collecting. state, county and city parks usually prohibit collecting. Please...MONZONITES, GRANODIORITES a. Quartz, orthoclase, microcline, oligoclase, albitc, blotite, muscovite, hornblende |  | | Journal (article/letter/editorial) | | during metamorphism: evidence from the Llano Uplift, Texas Gray E. Bebout* and William D. Carlson Department...Geological Sciences, University of Texas at Austin, Austin, TX 78713-7909, USA Abstract. A field, petrologic...California at Los Angeles, Los Angeles, CA 90024, USA Offprint requests to: * Present address: permeable...b.y.) Valley Spring Gneiss of the Llano Uplift, Texas (Fig. 1), present an excellent opportunity for the...feldspar) calc-silicates of 519 SAN SABA COUNTY / URN ET COUNTY f J jJ ~Moson : "': : , ~ . . : ; |  | | Journal (issue) | | by Ray Kizer Y ou know what I think, I think Texas is a beautiful place in the spring, that is at least...early spring is a great time to get out and see Texas. On the recent Paleo field trip to Lake Brownwood................ 4 Llanite and the Blue Quartz of Texas ..................................................President continued from page 1 So now it is spring in Texas and the club has started our field trip season,...Programs continued from page 1 June 24, 2014--Texas Topaz: B. Diane Eames is a fine jeweler, Graduate |  | | Report (volume) | | Del Norte County; Trinity River, Trinity County; Spanish Creek and Gopher Hill, Plumas County; Placerville...Dorado County; Cherokee Flats, Yankee Hill,and Oroville, Butte County; French Corral, Nevada County; Indian...Indian Gulch and Volcano, Amador County; and Alpine Creek, Tulare County. Other western localities are:...Diamond Basin, Ada County, Idaho; Curry County, Oreg.; and Nelson Hill, near Glacier County, Mont. The Great...Pierce County; Oregon, Dane County; Kohlsville, Washington County; Saukville, Ozaukee County; Eagle, |  | | Journal (article/letter/editorial) | | sulfidesin hypogeneveins formed from County,Arizona, Imperial County, California,Eu- hydrothermal solutions(Hariya...Dona Ana County,Black Diadepositsdiscussed above, rhodochrosite, generally mond mine, Grand County, Hidalgo...Hidalgo County and accompanied by rhodonite andalabandite, formedthe Socorro County, New Mexico). The manganese...Oklahomaand Big Muddy Mine, partin theepithermal Iron County,Missouri(HewettandFleischer, 1960). and alabanditeare...hypogeneveins in Mason bodies(Cu, Pb, Zn) and also gold-silverdeposits. County,Texas (Hewett and Schaller |  | | Journal (article/letter/editorial) | | Uplift, central Texas, USA C. M. R. LETARGO AND W. M. L A M B Department of Geology, Texas A & M University...College Station, TX 77843, USA ABSTRACT The Llano Uplift in central Texas is a Grenville aged (c. 1.1Ga)...that cover an area of about 6000km2 in central Texas (Fig. 1). Radiometric age determinations indicate...r""l PACKSADDLE SCHIST OF CALC-SILICATES, CENTRAL TEXAS 9 l pyroxene, quartz and calcite. Accessory minerals...garnet porphyroblasts, granoblastic plagioclase, microcline, clino- A N A L Y T I C A L PROCEDURE Minerals |  | | Journal (article/letter/editorial) | | igneous and metamorphic rocks from the Llano Uplift, Texas, was undertaken to investigate, in detail, potassiumargon...pluton and surrounding rocks from the Llano Uplift, Texas, suggests that this area has been involved in a...rhyolite porphyry, which gives an average Rb-Sr microcline age of 920 million years. A metasedimentary gneiss...earlier history. K-Ar determinations on several microcline and plagioclases give ages which are 5-20 per...earliest recognition of Precambrian rocks in central Texas was by T. B. Comstock (1890), who applied the terms |  | | Journal (issue) | | Menzies Pink topaz from the Thomas Range, Juab County, U ta h .........................................that fall outside these belts (e.g. in central Texas, southern Norway and Zimbabwe) are generally in...contents. The Brown Derby No. 1 pegmatite in Gunnison County, Colorado, is described by Rosenberg (1972). In...type May also be hydrotherm al Quartz, albite, microcline (incl. amazonite), zinnwaldite, fluorite, iron...phenakite, rarely spessartine, tourmaline Quartz, microcline, albite, lepidolite/muscovite, tourmaline, fluorite |  | | Report (issue) | | manganese mineralization was established by B. Mason (1943, p. 134) in the glacial boulders first found...occurs at Rakten in a quartz vein with white microcline, forming coarsely crystalline aggregates with...faces. Also at SörhĂ„rĂ„s it was associ ated with microcline. In the cases mentioned bixbyite is generally...distinctly of hydrothermal origin. The presence of microcline is, however, indicative of a comparatively high-temperature...group in Masonâs classification of the bixbyites (Mason I943, 1944)- MANGANESE MINERALIZATION IN THE ULTEVIS |  | | 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...cm high, Himalaya mine, Mesa Grande, San Diego County, California; E: Tourmaline, 13.8 cm, Madagascar; |  | | Book (edition) | | the gem sapphires came from the mines in Fergus County, where they occur in a rock matrix. The majority...The development of the opal deposits of Humboldt County, Nev., was attended with much success, and o. quantity...previous years. Benutuul a.met-hyst was found m Wa1Ten County, N. C., and some .fine gems have been cut from...beryl were obtained from prospects in Alexander County, N. C. Beautiful gems were cut from some of t,hese...1ocalities. Warren County.-Amethyst occurs at a number of places in Warren County, at; som_e.of which |  | | Journal (issue) | | MINERAL COLLECTIONS IN TEXAS III A SUPPLEMENT TO THE MINERALOGICAL RECORD, NOVEMBERâDECEMBER 2020 ... Mineral Collections in TEXAS UVolume IIIV With an Introduction by Wendell Wilson A Supplement to...NovemberâDecember 2020 MINERAL COLLECTIONS IN TEXAS Mineral Collections in Texas Volume III A Supplement to The Mineralogical...twin, 5.5 cm, from the Amo tin deposit, Ximeng County, Yunnan, China. Wally Mann collection; Joe Budd...2.2 cm, from the Pulsifer quarry, Androscoggin County, Maine. Kyle Kevorkian collection; Jordan Root |  | | Book (volume) | | beds, excavations, etc.ïŸSelenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...ïŸgray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...gravels, etc.ïŸpetrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: ï area ridges, slopes, stream beds...Guide for Rock Hounds in the United States CUSTER COUNTY AREA: The November Mine, 1.2 mi. SE of the Needles...of rd. a few yds., outcropïŸRose Quartz. DOUGLAS COUNTY CORSICA, S on US 281 to Armour, area rd. cuts, |  | | Report (volume) | | .......Mr. George H. Ashley, Washington, D. C. Texas............Dr. William B. Phillips, Austin. Vermont...See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities: Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20, Pv. 7 E.; Jefferson...Jefferson County, at Elyton; Lee County, at Chewacla lime works; St. Clair County, at Gfeensport; Shelby |
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Hoffman Ranch, Grit area, Mason County, Texas, USA