 | | Journal (article/letter/editorial) | | of sapphires from a lamprophyre dike at Yogo Gulch, Montana, USA: Clues from their melt inclusions Aaron...of sapphires from a lamprophyre dike at Yogo Gulch, Montana, USA: Clues from their melt inclusions, LITHOS...Origin of sapphires from a lamprophyre dike at Yogo Gulch, 1 RI Aaron C. Palke1*, Nathan D. Renfro1... SC *aaron.palke@gia.edu Montana Bureau of Mines and Geology, Montana Tech, 1300 West Park Street...Street, Butte, MT NU 2 PT Montana, USA: Clues from their melt inclusions 59701 MA ABSTRACT Gem corundum |  | | Report (volume) | | Corundum Deposits of Montana By STEPHEN E. CLABAUGH ^ GEOLOGICAL SURVEY BULLETIN 983 * .^ A description...and associated placer deposits___.______. ______ Yogo sapphire deposit. _________________________________________...occurrences. _-_--_--__--____--____-_-____-__-___ Quartz Gulch _____________________________________________ Pole..._______-_--_______________-_-___-_____-Chouteau County, _________________ _____________-________ Origin...____.__ Origin of the deposits in southwestern Montana.__-.-_---_-_... Hypothesis of igneous origin. ___ |  | | Journal (article/letter/editorial) | | Melt inclusions in alluvial sapphires from Montana, USA: Formation of sapphires as a restitic component... Melt inclusions in alluvial sapphires from Montana, USA: Formation of sapphires as a restitic component...MANUSCRIPT Melt inclusions in alluvial sapphires from Montana, USA: PT Formation of sapphires as a restitic component...Drive, Carlsbad, CA 92008, USA 2 Montana Bureau of Mines and Geology, Montana Tech, 1300 West Park Street...Street, Butte, MT 59701, USA MA *aaron.palke@qm.qld.gov.au †Present address: D Queensland Museum, Brisbane |  | | Journal (issue) | | area, San America’s Royal Gems – Montana and Yogo Sapphires Benito County, California; the group of sapGems...Mountain Mine, GranTantalizing Turquoise ite Country, Montana. Photos of gemstones Oregon Sunstone – A Rare and...Daniel Bronfen, Brazil Evan Caplan, USA Rocco Gay, Italy Sushil Goyal, USA Shahina Hatta, Hong Kong Dwarka...Thailand Immediate Past President Benjamin Hackman, USA Chief Executive Officer Gary Roskin ICA General Manager...31 W. 47th Street, Suite 1103 New York, NY 10036 USA ica@gemstone.org T: 1.212.620.0900 F: 1.212.352.9054 |  | Palke, Aaron C., Wong, Jacqueline, Verdel, Charles, Ávila, Janaína N. (2018) A common origin for Thai/Cambodian rubies and blue and violet sapphires from Yogo Gulch, Montana, U.S.A.?. American Mineralogist, 103 (3) 469-479 doi:10.2138/am-2018-6164 | Journal (article/letter/editorial) | | rubies and blue and violet sapphires from Yogo Gulch, Montana, U.S.A.? Aaron C. Palke1,2,3,*, Jacqueline...in blue to reddish-violet sapphires from Yogo Gulch, Montana, U.S.A., with rubies from the Chantaburi-Trat...The similarities between Thai/Cambodian rubies and Yogo sapphires suggest a common origin for gem corundum...used with caution. Keywords: Sapphire, ruby, Yogo Gulch, melt inclusions, corundum, gemology Introduction... 470 PALKE ET AL.: THAI/CAMBODIAN RUBIES AND YOGO GULCH, MT SAPPHIRES between the two countries. The |  | Filina, Maria I., Sorokina, Elena S., Botcharnikov, Roman, Karampelas, Stefanos, Rassomakhin, Mikhail A., Kononkova, Natalia N., Nikolaev, Anatoly G., Berndt, Jasper, Hofmeister, Wolfgang (2019) Corundum Anorthosites-Kyshtymites from the South Urals, Russia: A Combined Mineralogical, Geochemical, and U-Pb Zircon Geochronological Study. Minerals, 9 (4) 234 doi:10.3390/min9040234 | Journal (article/letter/editorial) | | mineral association includes corundum-sapphire, plagioclase (An61–93 ), muscovite, clinochlore, and clinozoisite...process at 440–420 Ma ago, most probably as plagioclase cumulates in a magma chamber. This cumulate rock...anorthositic complex is a part of the Tuyuan orogenic belt undergone a multiphase metamorphism of the amphibolite...anorthosite from the Chunky Gal Mountain (North Carolina, USA) [12] with pink-colored corundum is located in association...amphibolites and peridotites within alpine-type orogenic belt [13]. Corundum anorthosites (kyshtymites) are known |  | | Journal (article/letter/editorial) | | Montana Mineral Locality Index Downloaded by [University of Nebraska, Lincoln] at 20:00 09 April 2015...2015 K NOWN AS THE TREASURE STATE, Montana is rich in mineral and gemstone localities. The state motto...The middle third of the state is known as the Montana alkali province where the sediments have MICHAEL...Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded by [University... the Rocky Mountains, and furthest to the northwest, the belt basin. The Rocky Mountains contain sedimentary |  | | Journal (issue) | | Black Diamonds from Zimbabwe Characterization of Yogo Sapphires Synthetic Diamonds Chart 2018 GIA SYMPOSIUM...pg. 113 111 Summer Reading: Diamond Research, Yogo Sapphire, and Byzantine Garnet Duncan Pay FEATURE...Gemological Characterization of Sapphires from Yogo Gulch, Montana Nathan D. Renfro, Aaron C. Palke, and Richard...E. Kane James E. Shigley London, UK Helena, Montana Carlsbad, California John L. Emmett Stefanos...the Cover For more than 120 years, Yogo Gulch in central Montana has been one of the world’s most illustrious |  | | Report (volume) | | ............................................. Montana ....-.-.--.......................................___..__._....._..._______..__._.____..._.____.' Montana .............................................................................................. Montana ...............................................................-....--......... ..----........ Montana .........'... ................................... II. Outcrop of peridotite at Buck Creek, Clay County, N. C........ III. A, Corundum in chlorite at Corundum |  | | Report (volume) | | sapphires^......... ..........._............. ...... Montana sapphires ........ ..............................sapphires ...... _........................... Yogo Gulch sapphires ............................. ............................. ................. Macon County .........._. ...........,..-...........-.............. .......... .1...................... Clay County.. ...............................................tracts...................... ......... Jackson County ................ ............................. |  | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | blue sapphires 17 — Rio Mayo (Colombia) 18 — Yogo Gulch (USA) Detection limits (ppm) Ga Ti V Cr 14/4...blue sapphires 17 — Rio Mayo (Colombia) 18 — Yogo Gulch (USA) Detection limits (ppm) ±1σ 2 Average (ppm)...surrounding basement, as part of the Panafrican orogenic belt known from Sri Lanka and Mozambique to Antarctica...pargasite (Mg-rich amphibole), zircon, calcic plagioclase, uraninite, and allanite (Phukan, 1966; Gübelin...basaltic and andesitic stratovolcanoes of the Andean belt. These sapphires are blue, green, yellow, and pink |  | | Journal (article/letter/editorial) | | Nelsonite from the Western Adirondack Mountains of New York State, USA Robert S. Darling 1, *, Jessica L...Cortland, NY 13045, USA Hommocks Middle School, 130 Hommocks Road, Larchmont, NY 10538, USA; jgordon@mamkschools...Tower, Cornell University, Ithaca, NY 14853-6401, USA; erl1@cornell.edu Correspondence: robert.darling@cortland...sapphire-bearing sample (93-BD-35) is a medium-grained, plagioclase + biotite + microperthite + garnet + quartz +...sapphire-bearing nelsonite is characterized by plagioclase, biotite and new growth of garnet. Quartz, although |  | | Book | | associated with the Montana Bureau of Mines, mineral dealers and miners from MT, USA, sapphire fields. 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 fields. The gemstones were largely recoveries from...from eluvial and alluvial deposits, with some Yogo, Montana, stones related to a primary deposit [11]. Analytical...polysynthetic twinning, common in sapphires. Montana, USA, sapphire and ruby suites cover a number of |  | | 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...Pierce County; Oregon, Dane County; Kohlsville, Washington County; Saukville, Ozaukee County; Eagle, |  | | Book | | RWH PUBLISHING ~ }OB 28:18 BOULDER, CO LORADO USA 1997 ~ © 1997 by Richard W. Hughes All rights...Publishing 4946 Clubhouse Circle Boulder, CO 80301-3725, USA Tel: 303-530-7975; Fax: 303-530-7975 Publisher's...States of America (USA) 454 382 Idaho 454 Bibliography-Idaho 454 Montana 454 Yogo G ulch 454 Other Moncana...localities 460 Characteristics of Montana coru.ndwns 465 Bibliography-Montana 469 North Caroli na 472 Bibl...473 History 474 Luc Yen 474 Quy Chau (Bu Khang District) 475 Other Vietnam corundu.n1 localities 478 Mining |  | | Journal (article/letter/editorial) | | CORUNDUM-BEARING ROCKS, MADISON RANGE, SOUTHWESTERN MONTANA Abstract: Corundum-bearing rocks are associated...corundum-bearing rocks in the Madison Range of southwestern Montana are part of a Precambrian sequence of metasedimentary...tends to be concentrated next to corundum and on plagioclase grain boundaries. Corundum-bearing feldspathic... B50-4E). The sillimanite in part replaces plagioclase and parallels the foliation, although some crystals...masses that are commonly associated with turbid plagioclase. Although Clabaugh (1952, p. 86) noted a reciprocal |  | | Journal (article/letter/editorial) | | specimen from the railway cutting south-east of Little Arnage is of considerable interest as throwin g...biotite, iron-ores, green spinelle, and probably a little felspar, was analysed. It contained, as might naturally...the Burma rubies and is a marked feature of the Montana" sapphires." A very interesting case of the occurrence...titaniferous iron -ore, and, in certain special cases, plagioclase, orthoclase, garnet, spinelle, and corundum....of cordierite, andalusite, sillimanite, and plagioclase. The cordierite is irregular in form, intensely |  | | Book | | India, Australia, Kenya, Tanzania, Montana and North Carolina (USA), Nigeria, Afghanistan, Pakistan, Laos...Bariand, Urs Zwyssig, Donna Dirlam, John Koivula, Judith Kinmond, and Rita Pascolini. A special thanks is...India 92 Sapphire - Australia 94 Sapphire - Montana, USA 96 Ruby - Kenya 97 Sapphire - Umba Valley, Tanzania...Bibliography 300 Montana, USA 300 Yogo Guieb 301 Mineralogy of the Yogo sapphire 304 Other Montana corundum localities...309 Chapter 1 History of corundum In the mountains of Serendib (Ceylon) precious stones are found |  | | Book | | ROADSIDE % JEOLOGY of Montana David Alt and Donald W. Hyndman ROADSIDE N JEOLoGY of Montana David Alt Donald...Roadside geology of Montana. Bibliography: p. Includes index. 1. Geology — Montana — Guide-books. I. Hyndman...know something about the rocks and landscapes of Montana. We hope our professional colleagues will enjoy...dealing with the four major geologic provinces in Montana. Each starts with its own more specific narrative...Nearly every geologist who has ever worked in Montana contributed something to this book. We read almost |  | | Book (volume) | | brownish yellow octagonal calcite (21.30 ct), Montana; light yellow orthoclase feldspar (25.03 ct), Idaho;...Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal step cut violetish pink...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...oligoclase feldspar (5.04 ct), Oregon; and three Montana sapphires, violetish blue (2.52 ct), yellow (4...large-scale mining of sapphire-bearing gravels in Montana is beginning and is expected to produce large quantities |  | | Book (edition) | | from the Tourmaline Q ueen .1ine, Pala, San Diego County, California. From a pen-and-ink drawing by W. E...Leonard Enos, J. A. Ferguson, George M. Francis, Judith W. Frondel, Charles W. Fryer, R. Gordon Gastil...Corundum Hill, North Carolina 7. Eldorado Bar, Montana 8. W. D. Baltzley 9. Ellis mine pocket, Hiddenite...California 19. Sequist Ranch topaz area, Texas 20. Little Three mine, Ramona, California 21. Gem-bearing...of tourmaline crystal forms 38. Map of San Diego County, California gem sources 3 9. Stewart Lithia· and |  | | Journal (issue) | | chemical composition. 370 Alluvial Sapphires from Montana: Inclusions, Geochemistry, and Indications of a...Robert E. Kane Guanghai Shi London, UK Helena, Montana Beijing, China John L. Emmett Stefanos Karampelas...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA © 2015 Gemological Institute of America All rights...conditions. Alluvial sapphires from the U.S. state of Montana have long been celebrated for their kaleidoscope...rugged fringes of Australia’s arid Great Artesian Basin: Lightning Ridge, Koroit, Yowah, and Quilpie. Their |  | | Journal (article/letter/editorial) | | dead-time losses were necessary. TECHNIQUE Relatively little work has been done on refractory inclusions in...peaks is clearly shown in the mass spectrum of Yogo Gulch sapphire (Fig. 1). To check for background peaks...the slope of the Al/Mg calibration line for plagioclase, 1.22 (Hutcheon, 1981), differs from that of...AL 25 26 27 MASS FIG. 1, Mass spectrum of Yogo Gulch sapphire. The constant, low level of the background...spinel, Madagascar hibonite, Miyake anorthite and Yogo Gulch sapphire. At least one of these terrestrial samples | | | Book (volume) | | Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...oligoclase feldspar (5.04 et), Oregon; and three Montana sapphires, violetish blue (2 .52 et), yellow (4...large-scale mining of sapphire-bearing gravels in Montana is beginning and is expected to produce large quantities...c1ystals, many of facet-grade, found in the Wah Wah Mountains of Utah are to be mined by conventional open-pit...discovery and production in the continent, there is little doubt that many regions remain unexplored because |  | | Journal (issue) | | reportedly from the Kuh-iLal deposit in the Pamir Mountains of Tajikistan. p. 330 REGULAR FEATURES 337 354...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA © 2022 Gemological Institute of America All rights...spinel reportedly from Kuh-i-Lal in the Pamir Mountains of Tajikistan. To determine the cause of color...study of ruby (corundum) compositions from the Mogok Belt, Myanmar: Searching for chemical fingerprints. American...Chinese sapphire material was therefore considered of little economic value on the global gem market. The situation |
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