 | | Journal (article/letter/editorial) | | Institute of Technology, Pasadena, CA 91125-2500 USA Abstract: Hydroxide bands arising from intrinsic...phases and as a trace component of corundum itself. Belt (1967) described broad absorption bands combined...a ruby from Sri Lanka and a blue sapphire from Montana. Because the samples used in this study were faceted...1386 Yogo Gulch, Judith Basin Co., Montana LA 18947 Yogo Gulch, Judith Basin Co., Montana Yogo Sapphire...Sapphire Mine, Judith Basin Co., Montana Dry Cottonwood Gulch, Silver Bow Co., Montana El Dorado Bar, Lewis |  | | Book | | associated with the Montana Bureau of Mines, mineral dealers and miners from MT, USA, sapphire ļ¬elds. The...limited sources in Montana, USA. Transitional pink sapphires from Sri Lanka and Montana were also present...Thailand/Cambodia, Sri Lanka, Mogok, Myanmar and Montana ļ¬elds. The gemstones were largely recoveries from...from eluvial and alluvial deposits, with some Yogo, Montana, stones related to a primary deposit [11]. Analytical...trace element results for each constituent color group were accompanied by correlation matrices that brought |  | Sorokina, Elena, Rassomakhin, Mikhail, Nikandrov, Sergey, Karampelas, Stefanos, Kononkova, Nataliya, Nikolaev, Anatoliy, Anosova, Maria, Somsikova, Alina, Kostitsyn, Yuriy, Kotlyarov, Vasiliy (2019) Origin of Blue Sapphire in Newly Discovered SpinelāChloriteāMuscovite Rocks within Meta-Ultramafites of Ilmen Mountains, South Urals of Russia: Evidence from Mineralogy, Geochemistry, Rb-Sr and Sm-Nd Isotopic Data. Minerals, 9 (1) 36 doi:10.3390/min9010036 | Journal (article/letter/editorial) | | Discovered SpinelāChloriteāMuscovite Rocks within Meta-Ultramafites of Ilmen Mountains, South Urals of...gem quality was recently discovered in spinelāchloriteāmuscovite rock within meta-ultramafites near the...the Ilmenogorsky alkaline complex in the Ilmen Mountains of the South Urals. More than 20 minerals were...The sapphires formed together with the spinel-chlorite-muscovite rock during metasomatism at a contact...required for the formation of sapphireāspinelāchloriteāmuscovite rock was 700ā750 ā¦ C and a pressure |  | | Report (volume) | | corundum belt of North Carolina. General geology of the State. Geology of the corundum belt. Rocks of...of the corundum belt. 21 21 23 26 Chapter II.āThe peridotites and associated basic magnesian rocks.... Clay County. Macon County. Jackson County. Transylvania County. Swain County. Haywood County. Buncombe...Buncombe County . Madison County. Yancey County. Mitchell County . Watauga County . Wilkes County. Ashe County...County . Alleghany County . Physiography and ecology of the peridotites. 28 28 29 32 34 35 36 38 42 46 |  | | Book | | Discovered SpinelāChloriteāMuscovite Rocks within Meta-Ultramaļ¬tes of Ilmen Mountains, South Urals of Russia:...coloured by chromium and sometimes vanadium. The ļ¬rst group of authors in their review proposed an enhanced...(Shakisso), Madagascar (Mananjary), Russia (Ural mountains), Zambia (Kafubu) and Zimbabwe (Sandawana)). Their...genesis of gem-quality sapphires from the Ilmen Mountains (South Urals, Russia) found in situ within ultramaļ¬tes...These sapphires were formed together with a spinelāchloriteāmuscovite rock during the metasomatic alteration |  | | Book (edition) | | describes sites under of the nearest town and county. and the many maps included book contain such...Chicago, Illinois, Marcus Daly Pruett of Butte, Montana, Walter Wright of the Prospectors Shop and Herbert...Thousands of amateurs go out each year into the mountains and deserts of North America to collect a great...value in distinguishing one silicate from another. little visual tests that have been described, readings...refractive index are more useful. Among single group gem the is fact that they fizz in chrosite |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...thousands of amateurs venture every year into the mountains and deserts of North America, they enjoy not only...up during a stroll on a beach or a hike in the mountains first aroused their interest. earth sciences...gem minerals. A sharp sliver of agate, such as Montana moss agate, is also useful to test minerals near...chemical tests so useful with many minerals are of little value in distinguishing one silicate from another |  | | Book (edition) | | Corporate Drive, Suite 400, Burlington MA 01803, USA First published 1962 Second edition 1970 Third edition...Chrysoberyl Spinel Topaz Tourmaline The Garnets Feldspar Group Zircon Peridot 69 92 117 150 167 171 175 185 195...of the revisions over the years have added very little to the 1962 text! Chapters in this category have...book would be more sensibly shared out among a group of authors/gemmologists, each member tackling his...affection in which Websterās great work is held, I had little difficulty in finding willing contributors. As |  | | Book | | looking at the constituents of the rock, or at a group of obvious crystals, or at an ore, for example,...Brownstone, which is used for building in eastern USA, comes from Conn., Wy., Neb. Californian and S. Dakotan...mudstones, gritty in siltstones. Minerals include a little quartz, feldspar and mica. Massive or finely laminated...age. Mined in the Appalachian Mts. Peat occurs in USA and in Canada. Important mineral fuel, until recently...also brown or dark green biotite, hornblende, a little magnesite, opal, topaz. Some alignment of crystals |  | | Book | | distinct; however many of the differences are of little concern to the general field worker and for that...rocks contain large crystals, often of the feldspar group and are known as porphyries. The individual crystals...granite but with no quartz. Sandstone (South Dakota, USA) _9_ A darker rock than granite but with a similar...other books that a serious attempt to describe and group minerals could be seen to be in progress. His De...pairs. Water is often present and in the zeolite group it can escape when the minerals are mined since |  | | Report (volume) | | anonymous papers, placed at the end of Part I Co. county cos. Ā· counties CORPORATE AUTHORS. Am G American...the year of publication.] Abandoned valleys, Ohio basin: Campbell CM R), Ola Aberdeen-Redfield folio, S...paleontology, progress: Osborn, Ole Adirondack Mountains: Kemp, 92fi Miller (W J), 17a. See also New York...Kedzie, 77 Agriochoerus: Wortman, 95 &jo copper district, Ariz.: Joralemon, U Alabama. Benton Co.: Currey...54a Birmingham district: Burchard, 10C; Butts, 108; McCreath, 87a Birmingham-Macon belt: Spencer (J W) |  | | Journal (issue) | | diamond-bearing kimberlite pipes in the Orange River drainage basin have been extensively eroded and the released diamonds...into GEMS & GEMOLOGY Winter 1991 the drainage basin. There are an estimated 3,000 lzimberlite pipes...anywhere along the extensive Orange River drainage basin between the primary lzimberlite sources and the...diamonds that have been released into the drainage basin and have survived the erosional processes, we believe...months are characterized by ORANGE RIVER DRAINAGE BASIN Kimbertites with Diamonds Kimbertites without Diamonds |  | | Journal (issue) | | sapphire plays in the world gem market, surprisingly little has been written about this indigenous gem. This...content. The mining operations in the New England district are much more rigidly controlled in terms of conservation...environment) inside the chamber. INCLUSIONS Very little detailed study has been done on inclusions in Australian...for sapphire processing and marketing. Now) with little production from Thailand's own mines and the virtual...MacNevin A.A. (1972)Sapphires in the New England District of New South Wales. Records of the Geological |  | | Book | | copper are in the Keweenaw Peninsular, Lake Superior, USA, the largest being I 5 x 7 x 3m (approx. 50 x 23...occurred in the Ray mine and in Bisbee, Arizona, USA. Very fine spinel-law twins up to 5 cm in size and...dendritic aggregates come fron1 Mednorudnyansk, Ural mountains, Russia; crystals up to 30 mm ('3/i6in) were found...Keweenaw Peninsula near Lake Superior, Michigan, USA. Wires, up to 100 mm (4 in) long, come also from...Colorado, USA. Fine crystals were also found in Berezovsk, Ural mountains and in the Lena River basin, Siberia |  | | Book | | copper are in the Keweenaw Peninsular. Lake Superior, USA, the largest being 15 x 7 x 3m (approx. 50 x 23 x...occurred in the Ray mine and in Bisbce, Arizona, USA. Very fine spincl-law twins up to 5 cm in size and...dendritic aggregates comc from Mednorudnyansk, Ural mountains. Russia; crystals up to 30 mm ( : Vie in) were...Keweenaw Peninsula near Lake Superior, Michigan, USA. Wires, up to 100 mm (4 in) long, come also from...California, USA (Colorado Quartz mine. Nigger Hill and others). Fine leaf gold comes from Rosia Montana. Romania |  | | Book | | New Fetter Lane, London EC4P 4EE Published in the USA by Chapman and Hall 29 West 35th Street, New York...a mineral belonging to the actinolitetremolite group having the nature of an asbestos. cabochon a gemstone...such as oil (e.g. in some fluorite from Illinois, USA). Among the large number of gases are methane, ethane...weathering; garnet crystals may alter (in the main) to chlorite and olivine may alter to serpentine or to Inclusions... Inclusions in the major gemstones 11 chlorite. Olivine inclusions appear as transparent crystallites |  | | Book | | Shaub -y Treasures from the earth PUBLIC LIBRARY COUNTY, FORT WAYNE AND ALLEN IND. Treasures from...on the other hand, visible chiefly in reflect little light relation around them that do reflect light...some ever, you may closed by crystal faces. Mountains of upper the New York State. Crystals of minerals...numerous the brilliant quartz crystals found in the Little Falls You of the cubic crys- so extreme as to... geniculated twin, which is seen commonly In group are parallel lines The clase often ā ā that |  | | Book (edition) | | is better quality lapis lazuli from Badakshan district, of Afghanistan, or 2 DICTIONARY OF GEMS...resembles any variety of agate. aggregate. Ciuster or group. See crystalline aggregate. Ago Bay. Historically...substitutes such as rock, glass, and pearl with little nacre, Al. Abbr. for the element aluminum, āAlabandine...species of the plagioclase series of the feldspar group, of which albite moonstone, sunstone and aventurine...to the Association. The ASIA is strictly a trade group and does not indulge in any business enterprises |  | | Journal (issue) | | diamond ā¢ Large type IIa diamond from Arkansas, USA ā¢ Artificial glass imitating ParaĆba tourmaline ā¢...inclusions in green common opal ā¢ Intense purplish pink Montana sapphire ā¢ Largest CVD-grown diamond submitted...add GST. Discounts are available for renewals, group subscriptions, GIA alumni, and current GIA students...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA Ā© 2020 Gemological Institute of America All rights...half maximum at ~976 cmā1 (Ī½1, related to the PO4 group of monazite) after all annealing steps. The results |  | | Book (edition) | | attempt a complete description of a small mineral group to uncover the unsatisfactory state of our present...proposed (and now regularly cited) for which we have little but a tent ative formula and some optical data...well render the volume difficult to use by a large group of potential readers not familiar with structural/chemical...with the inherent problems of end-member names vs. group names and related aspects of nomenclature. Rather...spelling variants, descriptive names, mixtures, group names, chemical names, etc., found in the literature |  | | Book (edition) | | extensively rewritten by the book's distinguished group of authors in the light of new research and important...vivianite, Bolivia; ( center, right) topaz, Thomas Mountains, Utah; (lower le ft) rhodochrosite, N'Chwaning...Willard Lincoln. Encyclopedia of minerals ~~cbe County Public Library Saguache, Colorado OEMCO For Refere...all varietal names, synonyms, spelling variants, group names, and so forth; only names in contemporary...contemporary use have been included. Most of the mineral group lists presented were taken from the Glossa,y of Mineral | | | Book (edition) | | extensively rewritten by the bookās distinguished group of authors in the light of new research and important...vivianite, Bolivia; (center, right) topaz, Thomas Mountains, Utah; (lower /eft) rnodochrosite, NāChwaning...Lincoln. Encyclopedia of minerals Sagiiache County Pu blic Library Saguache , Colorado DEMCO For...Photo Editor: Wendell E. Wilson Library Saguache County Public Saguache, Colorado VAN NOSTRAND REINHOLD...all varietal names, synonyms, spelling variants, group names, and so forth; only names in contemporary | | | Book | | New Fetter Lane, London EC4P 4EE Published in the USA by Chapman and Hall 29 West 35th Street, New York...a mineral belonging to the actinolitetremolite group having the nature of an asbestos. cabochon a gemstone...such as oil (e.g. in some fluorite from Illinois, USA). Among the large number of gases are methane, ethane...weathering; garnet crystals may alter (in the main) to chlorite and olivine may alter to serpentine or to Inclusions... Inclusions in the major gemstones 11 chlorite. Olivine inclusions appear as transparent crystallites |  | | Report (volume) | | __________________________________-____ The zoisite group _ ______________________ Topaz __________________________________...are possible, they reduce on analysis to a small group of substances which are called elements. It is not...greenockite. Ccesium. A rare metal of the alkaline group, allied to potassium. Often found in lepidolite...having petrographic importance. Cerium. One of the group of elements known as the metals of the rare earths...Chlorine. The most abundant element of the halogen group. Commonly found as sodium chloride, as in sea water |  | | Report (volume) | | ........................ 68 The St. Lawrence basin............................................. The................................. The Mississippi basin.............................................. Southwestern.............................. The Columbia River basin......................................... Other northwestern...Bonneville basin.................................................. 154 The Lahontan basin..............nephelite group.................................................. The cancrinite-sodalite group........ |
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