 | | Report (issue) | | of America PHOTO CREDITS Cover: Quartz variety amethyst, 10.5 cm tall Goboboseb Mountains, Erongo Region...collection, Jeff Scovil photo Title (facing) Page Amethyst mouse with gold tail, 130 grams, 6.3 cm wide Carved...Brazilian amethyst Private collection, Robert Weldon photo © 2009 GIA Page 2 Quartz variety amethyst, 3.5...3, Table of Contents Insets Top: Circa 212 CE amethyst intaglio bearing the portrait of Roman Emperor...Marie-Lan Nguyen photo Upper middle: Quartz variety amethyst (Japan-law twin), 1.6 cm tall Andilamena, Toamasina |  | | Journal (issue) | | SKIPA N ATOM: Lake Superior’s Mystery Agates ROCK & GEM • Vol 47 No. 07 • U.S. $5.99 • Issue Code:...mystery gems. 22 14 By Jack Hobart MOUNT IDA CRYSTAL HUNT 22 Collecting Arkansas quartz in the Ouachita...Colorado’s Last Chance. 34 By Steve Voynick 48 54 ROCK & GEM KIDS 46 MAJOR SPECIMEN LOCALITIES Part I:...Month ....8 Bench Tips ......................... 20 Rock Science .................... 32 What to Cut ......QUESTIONS? Call (855) 777-2325 Printed in U.S.A. Rock & Gem (ISSN 0048-8453, USPS 486290) is published |  | | Report (issue) | | publication have also been corrected. Photo 1. Crystal clusters require tender care in the extraction...amethystine rock as shown in this picture of a highway restaurant at Sibley. (ii) AMETHYST DEPOSITS OF...purpose of this guidebook is to give an account of amethyst, describing its properties, lore, uses as a gemstone...purple coloured robes. Ontario has recently1 chosen amethyst, the purple variety of quartz, to be the official...aesthetic appreciation of the clear crystal referred to in names like Amethyst Bay in Thunder Bay or Quartz |  | | Journal (article/letter/editorial) | | cryptocrystalline quartz is composed of micro scopic crystal grains. The names of the crystalline varieties...degree of transparency and include rock crystal (colorless), amethyst (violet to purple), smoky (light...intergrown ag gregates of microscopic quartz crystal grains with a fibrousto-granular texture. Macroscopically...chemical composition S i 0 (silicon diox ide) and a crystal structure based on S i 0 " tetrahedra that are...and z. B: Left-hand crystal with m, r, z, ' s , and 'x. C : Right-hand crystal with m, r, z, s, and |  | | Book | | minerals and gemstones (of the latter garnet, amethyst and jasper are typi cal). The mines do not need...chite. torbernite, cuprite, are but a few; and amethyst and jasper are not rare. Wheal Gorland (O.S. map...concen tration is to the west, in the Tavistock district. Singling out a couple at random, South Tamar...Valley, is another concentration of mines. Great Rock (O.S. map 176.820817) is notable for micaceous hematite...china clay pits often provide good quartz and amethyst crystal groups, as well as turquoise, wavellite, wolfram |  | | Book | | vugs of crystalline talc. Easily the best extant crystal, a doubly terminated floater found in a talc vug...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...extracted excellent loose ilmenite crystal clusters from a calcite vein-dike digging site which they called...ilmenite specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed...mine before 1964). The mineral assemblage of the vein-dike consists of ilmenite. magnetite, anatase, biotite |  | | Book | | collections. I About this Book Fluorite on amethyst. Wheal Jane, near Truro (le(t) . Bornitc, Corn...Many of these are spectacu - !ar n co'ou-- and crystal hab1 . Luckily for us :od2;. o r':!rs appreoa ed...Tor. Twelve Mens Moor. Bodmin Moor (left). Amethyst vein. Stjust. WesL PenwiLh (above) prE:se~,, g or...have been carved into small objects. The granite rock, which forms the county's 'backbone ', produced...well as two scenic views to give a flavour of the district. Such a plethora of wonderful minerals - each |  | | Book | | the British Isles is the ideal book for the avid rock-hound to keep in his car or knapsack, next to his...has compiled an invaluable reference book for the ‘rock-hound’. A short introduction contains hints on...fascinating minerals as chalcedony and jasper, amethyst and tourmaline. Two chapters describe the physical...crystalline species is accompanied by a diagram of its crystal structure. Cover photograph: Fluorite, Wearda/e...reproduced by permission of Mr E. A. Jobbins. The crystal forms of quartz, topaz and fluorite are given after |  | | Journal (issue) | | on display at the Imperial Treasury Vienna in Austria. As part of an interdisciplinary research project.../ No. 5 / 2023 Amethyst/Carnelian Association from Madagascar | Aquamarine Crystal with Large Mobile...National University of Ireland Galway John L. Emmett Crystal Chemistry, Brush Prairie, Washington, USA Emmanuel...COLOURED STONES Unusual Amethyst and Carnelian Association from Madagascar Amethyst has long been a popular...unusual faceted stones that were a combination of amethyst and carnelian. The parcel consisted of about 30 |  | | Report (issue) | | Formation from the fault-controlled Creede mineral district to the north of the caldera. Diagenetic reactions...Survey (Denver) using a Leco carbon apparatus and Rock-Eval anhydrous pyrolysis. The authigenic mineralogy...carbonate-free, fine-silt fraction was used because volcanic rock fragments, pyrogenic crystals, and soluble carbonate...subaerial exposure is rarely present. Facies in the lower part of the sequences are similar to either sed...vitric- and crystal-rich compositions, whereas basin-margin facies tend to be more crystal-and lithic-rich |  | | Book (edition) | | ............................................. Amethyst ................................................the mines in Fergus County, where they occur in a rock matrix. The majority of these stones have the true...of Brookneal, Va., for information concerning amethyst; J.E. Turner, of Hiddenit.e, N. C.; Lovat Fraser...information conreming petrified wood. AMETHYST. DIS.TRIBUTION. Amethyst is widely distributed over the Piedmont...Fine gem amethyst has already been obtained from some of the 1ocalities. Warren County.-Amethyst occurs |  | | Book (volume) | | commerce. Coarser gemstones, or those which are rock-like in character or abundance, are treated in still...Department of Conservation; and on the Four Peaks amethyst deposit in Arizona by Dr. F. W. Galbraith of the...Gemstones, Crystals, The Geometry of Crystals, Crystal Growth, Cleavage, Specific Gravity, Light upon...645 668 List of Illustrations . Six crystal systems . A crystal lattice . Refraction and reflection of...Murfreesboro diamond mine . A California diamond crystal . Seven corundum crystals . Map of Corundum Hill—Ellijay |  | | Journal (issue) | | TRIM SAW COMPLETE by Lortone Stock No. 1-0877 6" ROCK RASCAL-MODEL ”J” TRIM SAW $307.00 SALE Stock No...on Hughes creek regular columns by Rob Towner Rock & Gem Kids .......................................Talk .......................................... 18 Rock Science ................................... 26 What...advertisements. For this reason, advertisements appearing in Rock & Gem should be considered as requests to inquire...notice. 4 www.rockngem.com rg_toc_0714.indd 4 Rock & Gem (ISSN 0048-8453, USPS 486-290) is published |  | | Journal (issue) | | Minerals The Storied Collection of Merritt Romans ROCK & GEM • Vol 47 No. 11 • U.S. $5.99 • Issue Code:...Steve Voynick 48 ROCK & GEM KIDS 46 A STORIED COLLECTION 48 Merrit Romans’ rock museum is a small-town...Month ....8 Bench Tips ......................... 22 Rock Science .................... 34 What to Cut ......QUESTIONS? Call (855) 777-2325 Printed in U.S.A. Rock & Gem (ISSN 0048-8453, USPS 486290) is published...advertisements. For this reason, advertisements appearing in Rock & Gem should be considered as requests to inquire |  | | Journal (issue) | | increasing the knowledge and experience of its members in rock, mineral, gemstone and fossil collecting and their...several did. Brian Craik-Smith Class 2 A Mineral or Rock Specimen - British There was a full table for this...Barratt one of our longer serving members) to an amethyst vein in granite from Hartshope Bum, Cheviot entered...· Peter Nancarrow Class 2a A Single Mineral or Rock Specimen - Foreign There were only six entries... Trevor Devon Class 3 A Display of Mineral or Rock Specimens - British The winner in this class was |  | | Report (volume) | | lead to the discovery of a new mineral or a new crystal form. He can surely use the description for planning...from 1ninerals. F·xcept for native gold and the rock-forming minerals that comprise construction materials...gold"--commonly either muscovite or pyrite. As soon as vein gold was found in place in 1859 in the Gregory diggings...galena that had been recently found in the Tenmile district, Summit County. In his booklet, which today would...increase in numbers of amateur mineral collectors, or "rock hounds" during the past decade or two. Concurrently |  | | Book (volume) | | be estimated from the pale rectangular step cut amethyst (left, upper group) which measures about 25 mm...conventional open-pit methods and the enclosing rock crushed and treated to release the crystals. Red...periodical literature, especially in Rocks & Minerals, Rock & Gem, Lapidary Journal, The Mineralogical Record...Gregorio, Fayetteville, PA; Jeanne Gurski, Jeanne’s Rock & Jewelry, Southeast Houston, TX; Dr. George E....Post, Cave-in-Rock, IL; Dr. J. Michael Howard, Arkansas Geological Commission, Little Rock, AR; Richard |  | | Report (issue) | | simplification by AGI the Sections on County Index and Rock Unit Index were merged into a broader Subject Index...e. the county or by the subject material or the rock unit name, and of course if the author's name is...1983-. ISSN: 02634546. International Journal of Rock Mechanics and Mining Sciences. Oxford-New York:...00207624, CODEN: IJRMA2. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts...00741876, CODEN: IAPPC8. Proceedings- Symposium on Rock Mechanics. New York, NY: American Institute of Mining |  | | Journal (issue) | | 368 by Charles Milton Axinite, Hydromagnesite, Amethyst and other minerals from near Vitoria da Conquista...available. Most important is the chemistry of the host rock and associated minerals, if any. One should always...fre quently is here at the National Museum, one crystal fragment of the unknown is removed and examined...other salient optical features is also made. The crystal is then powdered, ir radiated with X-rays of known...or uses for the compound, and work on similar crystal structures. If the compound has been previously |  | | Book | | WHAT IS PROBABLY THE WORLD'S FINEST APOPHYLLITE CRYSTAL, CENTREVILLE, VA. SPECIMEN C O L L E C T E D B...rubies, sapphires, aquamarines, garnets, topaz, amethyst and golden beryl are among the historic gems of...Carolina. An enthusiastic family found and mined an amethyst deposit in South Carolina which is pro ducing...state increase in direct proportion to the amount of rock hobby interest. There is little reason for any area...is another progressive city which caters to the rock hunter. Besides sponsoring one of the most successful | | | Book (volume) | | be estimated from the pale rectangular step cut amethyst (left, upper group) which measures about 25 mm...conventional open-pit methods and the enclosing rock crushed and treated to release the crystals. Red...periodical literature, especially in Rocks & LV!.inerals, Rock & Gem, Lapidary Journal, The Mineralogical Record...Gregorio, Fayetteville, PA; Jeanne Gurski, Jeanne's Rock & Jewelry, Southeast l-louston, TX; Dr. George E...Post, Cave-in-Rock, IL; Dr. J. Michael Howard, Arkansas Geological Comnussion, Little Rock, AR; Richard |  | Collins, Donley S., Cobban, Robert R., Foord, Eugene E., Murphy, Jack A. (1989) Bibliography for update and revision of U.S.G.S. Bulletin 1114, Minerals of Colorado -- a 100 year record, by Edwin B. Eckel, Part A - Paper copy --Bibliography data file disks. Open-File Report Vol. 1989 (89-206) US Geological Survey doi:10.3133/ofr89206a | Report (issue) | | Thalenite in the White Cloud pegmatite, South Platte district, Jefferson County, Colorado [abs.]: Canadian Mineralogist...567. Ahmed, F. R., and Barnes, W. H., 1963, The crystal structure of rossite: Canadian Mineralogist, v...RMO-634, 8 p. Andrews, C. I., 1895, The volcanic rock of Alum Hill, Boulder County, Colorado: Colorado...Proceedings, v. 5, p. 148-155. Anonymous, 1987, Endicott amethyst locality, Twelve Mile Park, Fremont County, Colorado:...Appleman, D. E. , and Evans, H. T. , Jr., 1957, The crystal structure of carnotite [abs.]: Acta Crystallographica |  | | Book | | been properly depicted in books. In addition, the rock types commonly used in Finland as gemstones, are.... . . . . . . . 196 13 Striped quartz-epidote rock in Iisalmi . . . . . . . . . 199 Breccias and mylonites...201 Finnish speciality, rock types as gemstones . . . . . . 19 Serpentine rock in Ankele . . . . . . .... . . . . . . . . . . . . . . . . . . . . 85 Amethyst deposits of Lapland . . . . . . . . . . . . ...in 1990. Risto is specialized in natural stones, rock aggregates, industrial minerals and gemstones. He |  | | Book (volume) | | morganite crystals, including one very pale pink beryl crystal, which though essentially of nongem quality, is... is arguably the most important gem-pegmatite district in North America. Its wealth of tourmalines, morganites...the rock or matrix in which they were originally found. Removal of crystals from their host rock invariably...attempt to obtain a single crystal from matrix. The interest in matrix rock lies in the information collectors...from their host rock can result in breakage or the revealing of ugly scars where the crystal was interrupted |
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