DOCSLIB.ORG

The Georgia Mineral Society *Atlanta, Georgia* Volume XXXV/Three March 2006

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Georgia Mineral Society *Atlanta, Georgia* Volume XXXV/Three March 2006 The Georgia Mineral Society *Atlanta, Georgia* Volume XXXV/Three March 2006 As I said, it does take a little time to catalogue. You also THE PRESIDENT’S MESSAGE have to find a numbering system which works for you. I tried five different numbering systems before I found the How long have you collected rocks, minerals, gemstones or one that I use now. My system could very well not work for fossils? Do you purchase them? Do you swap for them? you. It doesn’t matter as long as you do something. Do you collect them yourself? How much did you pay? With whom did you swap? Where did you collect them? In a few years, when you look at your specimen with When did you obtain them? Do you know what they are? documentation, you will know how you obtained the specimen, where it is from, how much you paid and even The above are very simple questions. You should know what it is. It isn’t a matter of us losing our minds, it is a the answers, but do you? matter of there being just too much information to remember about every specimen that we have. Most of us place our new specimens on display. Some of Kim Cochran, GMS President us just stick them away someplace. Many of the pieces may not see the light of day again for months or even FEBRUARY GENERAL MEETING years. When they do show up again, can you answer the above questions? You don’t need to know the answers 7:30 P.M., MONDAY, March 6, 2006 because they had a label giving the information. Chamblee Library 4114 Clairmont Road The truth is that time plays tricks on us. We may not be 770.936.1380 able to answer those questions in a few years. It is important that you have documentation on your treasures. Gem Identification I have collected for forty+ years. The oldest piece in my by Kim Cochran collection is from 1968. How do I remember the source of my specimens, when I obtained them, or how much I paid? It’s been three years since Kim’s last identification quiz, so Without documentation I might not know this about many of my 6,000 specimens. It is very important to keep some it seems fitting to have another one to keep us on our toes. kind of records. Being in charge of the “gem box”, Kim is sure to bring some beautiful eye candy for us. So bring your thinking caps, When I obtain a specimen, I log it into a book. Eventually, I there will be a prize for the one with the most correct get around to cataloguing the specimen. I record what it is, answers and for the runner-up also. the variety, size, location, and how it was obtained. A number is written on the specimen. There is a corresponding number on an information card and on the Show & Tell box in which the specimen is stored. You might say that this is a lot of work. It does take a little time, and I need to Mary and I have been to the Sheffield Mine (Star Rubies) be in the proper mood to catalogue. Still, it is important to and the Mason Mine (Sapphires) in Franklin, North do something. Carolina. We’d love to see what you’ve found! You might wish to sell or swap a specimen. There are people that I have known who have sold or given away their entire collections. There have been many instances where I appraised or disposed of collections of those who Looking Ahead: have left us. I might know what the specimen is and where it came from. I might not. There can be a big difference in • April 3, and May 1, 2006 - Speakers to be announced.. the value of a specimen which has documentation compared to the same specimen which has no Dylan Porter documentation. GMS VP/Programs Page 2 Tips and Trips March 2006 The Georgia Mineral Society The Georgia Mineral Society, Inc. A Non-Profit Educational Organization Seventy Years of Tradition Objective and Purpose: “To Educate the Youth of the State and the Members of this Society In the Field of Earth Science” AFMS Education - All American Club 2003 Bulletin Contests: 2003: First Place Small Bulletin AFMS, Third Place Small Bulletin SFMS; 2004: First Place Large Bulletin AFMS & SFMS Executive Board President Executive VP/Membership Vice President/Programs Secretary Kim Cochran Lizabeth McClain Dylan Porter Mary Porter 2695 Van Court 378 5th Street, Apt. 3 196 High Creek Drive 196 High Creek Drive Snellville, GA 30278 Atlanta, GA 30308 Roswell, GA Roswell, GA 770.979.8331 404.872.6310 770.998.1018 770.998.1018 [email protected] [email protected] [email protected] Treasurer Gem Section Chair Mineral Section Chair Fossil Section Chair Teresa Curl Kim Cochran Julian C. Gray Martha Brown 889 Veeler Road 2695 Van Court 524 Robin Lane 4837 Greenway Road LaFayette, GA 30728-6615 Snellville, GA 30278 Marietta, GA 30067 Norcross, GA 30071 706.764.2291 770.979.8331 770.973.3632 770.448.0876 [email protected] [email protected] [email protected] Junior Section Chair Micromount Section Chair Immediate Past President Trustee to 2006 George Prince Dave Babulski Douglas P. Daniels Frank Decaminada 2434 Caladium Drive 2677 Colony Circle 3660 Prince Way 795 Nile Drive Atlanta, GA 30345 Snellville, GA 30078 Tucker, GA 30284 Alpharetta, GA 30022 770.414.5533 678.580.2475 770.723.1359 770.992.8309 [email protected] [email protected] [email protected] [email protected] Trustee to 2007 Trustee to 2008 Tips & Trips Editor Field Trip Co-Chairs Bill Waggener Patricia Joan White Carolyn L. Daniels George Libby Greg Grieves 9146 Sunset Drive 9146 Sunset Drive 3660 Prince Way 1730 Rhett Butler Dr. 1760 Northside Dr., Jonesboro, GA 30238 Jonesboro, GA 30238-4520 Tucker, GA 30084-8317 Lilburn, GA 30047 Apt 119 770.978.2117 Atlanta, GA 30318 770.478.5734 770.478.5734 770.723.1359 404.314.8143 [email protected] [email protected] [email protected] [email protected] May Show Chair December Show Chair Webmaster Education Chair Jay Gorday Kim Cochran Jim Flora Anita Westlake 1690 Granger Court 2695 Van Court P.O. Box 605 1253 Spencer Drive Chamblee, GA 30341 Snellville, GA 30278 Hiawassee, GA 30546 East Point, GA 30344 770.986.0822 770.979.8331 706.896.8040 404.761.7849 [email protected] [email protected] [email protected] Committee Chairs December Show Committee Chairs The article submittal due date for Bill Waggener 770.478.5734 Adopt-A-Highway the April 2006 newsletter is Show Chair Jay Gorday 770.986.0822 Assets/Equipment Open to Volunteers March 10, 2006. Dealer Chair Martha Brown 770.448.0876 Awards Patricia Joan White 770.478.5734 GENERAL MEETINGS Exhibits Open to Volunteers Curator/Gem Box Kim Cochran 770.979.8331 General meetings are held on the first Monday of John Trimble 770.425.5075 Building John Trimble 828.264.4811 each month. In the event that the first Monday is a Demonstrations holiday and/or the facilities are not available, the Historian Roxanne Lopez 770.436.0387 meeting will be held on the third Monday of the month. Hospitality Open to Volunteers Facilities Jay Gorday 770.986.0822 General meetings are currently held at the Chamblee Branch of the DeKalb County Library System. Any Treasurer Teresa Curl 706.764.2291 Hospitality Margaret Ronan 404.636.0720 deviations from the above schedule will be announced in Tips and Trips. Librarian Julian C. Gray 770.888.9331 Advertising Perry & Teresa Curl 706.764.2291 Parliamentarian Patricia Joan White 770.478.5734 The Georgia Mineral Society on the Internet: Dealer Dinner Patricia Joan White 770.478.5743 Kim Prakash & 770.879.0476 http://www.gamineral.org Refreshments Nancy Marden 770.447.8542 E-mail Early Notification Program: A field trip and club Database Patricia Joan White 770.478.5743 Special Events Bill Waggener 770.478.5734 news update service. To join, members are requested to send in their current e-mail address to: Grab Bags Kim Cochran 770.979.8331 Sunshine Barbara Libby 770.978.2117 [email protected]. Tips & Trips Patricia Joan White 770.478.5734 Auction Kim Cochran 770.979.8331 Labels Chat Group: Sign on at http://groups.yahoo.com/group/gms_discussions/. To Set Up/Take Open to Volunteers Telephone George Libby 770.978.2117 subscribe, send an email to gms_discussions- Down [email protected]. SFMS Rep. Frank Decaminada 770.992.8309 Announcements for educational publications, continuing education classes, and shows or exhibits are provided in Tips and Trips as a service to GMS members. Appearance of the above in Tips and Trips does not constitute an endorsement by GMS. Tips and Trips Page 3 The Georgia Mineral Society March 2006 GMS MARCH FIELD TRIP DMC Program of the SFMS Field Trip Committee March 11, 2006, 10:00 A.M.-NOON An Official Field Trip of The Gaston County Gem, Vulcan Materials Company, Southeast Division 1272 Duncan Road, Kennesaw GA. 30144 Mineral & Faceting Club (HOST) and 770.427.5277 An Official Field Trip of the Georgia Mineral Society FEE: This is a free tour. 8:00 A.M. - NOON (EST) - SHARP! Saturday, March 18, 2006 COLLECTING: This is a working mine. They are currently Martin-Marietta Aggregates Quarry down to about 600 feet and are bringing up the hard granite to be crushed and used in industry. One of the information Statesville, NC officers from Vulcan will be bringing us down to the floor of this open pit mine and explaining their operations to us.
Load more

Recommended publications
  • Elimination of Ferric Ion Effect on Separation Between Kyanite and Quartz Using Citric Acid As Regulator
    minerals Article Elimination of Ferric Ion Effect on Separation between Kyanite and Quartz Using Citric Acid as Regulator Yanping Niu 1, Ya Li 1, Haoran Sun 2,*, Chuanyao Sun 3, Wanzhong Yin 2 and Hongfeng Xu 4 1 Heilongjiang Province Geology Ore Test and Application Institute, Harbin 150000, China; [email protected] (Y.N.); [email protected] (Y.L.) 2 College of Resources and Civil Engineering, Northeastern University, Shenyang 110816, China; [email protected] 3 State Key Laboratory of Mineral Processing, BGRIMM Technology Group, Beijing 100160, China; [email protected] 4 Heilongjiang Mining Group Co., Ltd., Harbin 150000, China; [email protected] * Correspondence: [email protected]; Tel.: +86-188-4250-4743 Abstract: Ferric ions produced during grinding influence the flotation separation between kyanite and quartz adversely. In this study, citric acid was used as a regulator to eliminate the effect of ferric ions on the separation of kyanite from quartz with sodium oleate (NaOL) as a collector. The microflotation test results indicated that the quartz was selectively activated by FeCl3 and maintained significant quartz recovery. However, the citric acid could selectively eliminate the effect of ferric ions on the quartz and minimally influenced the kyanite. Contact angle tests demonstrated that FeCl significantly increased the interaction between NaOL and quartz, resulting in the high 3 hydrophobicity of quartz, and the addition of citric acid made the quartz surface hydrophilic again but slightly influenced the kyanite. Fourier-transform infrared spectroscopy showed that FeCl Citation: Niu, Y.; Li, Y.; Sun, H.; Sun, 3 C.; Yin, W.; Xu, H. Elimination of facilitated NaOL adsorption onto the quartz surface, and the addition of citric acid eliminated the Ferric Ion Effect on Separation activation of FeCl3 on the quartz, resulting in the nonadsorption of NaOL onto the quartz surface.
    [Show full text]
  • Some Uncommon Sapphire “Imitations”: Blue Co-Zirconia, Kyanite & Blue Dumortierite Dr Michael S
    Some Uncommon Sapphire “Imitations”: Blue Co-zirconia, Kyanite & Blue Dumortierite Dr Michael S. Krzemnicki Swiss Gemmological Institute SSEF [email protected] 筆者滙報數個瑞士珠寶研究院(SSEF)近期收到 in the ring showed a negative RI reading 要求鑑證的藍色寶石，經檢測後確定其中包括 (above 1.79), an isotropic optical character 一些非常罕見的藍寶石模擬石：含錮氧化鋯、 (polariscope) and thus no pleochroism at all. 藍晶石及藍線石等。 Under the microscope, we saw no inclusions, however a slightly greenish reaction under Sapphires are among the most abundant gems the LWSW and there was a weaker similar we receive at the Swiss Gemmological Institute reaction under SWUV lamps. Based on these (SSEF) for testing. From time to time, however, properties and a chemical analysis by X-ray we are quite surprised by the imitations which fluorescence (EDXRF), the blue stone was we find among the goods sent in and this can readily identified as cubic zirconia (ZrO2). then be disappointing news for the clients. In Having seen this artificial product in a wide the following short note, the author presents a range of colours, the author had not previously few uncommon imitations identified recently at seen one of such a saturated and attractive the SSEF. Identification of these imitations is blue. Based on literature (Nassau 1981) the straightforward and should be no problem for analysed traces of cobalt in that stone have any experienced gemmologist. been identified as the colouring element in this specimen. The absorption spectrum of the stone The first case is that of an attractive blue (Fig. 2) – although superposed by several rare faceted stone of approximately 1.4 ct, set in a ring with diamonds (Fig.
    [Show full text]
  • Metamorphic and Metasomatic Kyanite-Bearing Mineral
    Metamorphic and Metasomatic Kyanite-Bearing Mineral Assemblages of Thassos Island (Rhodope, Greece) Alexandre Tarantola, Panagiotis Voudouris, Aurélien Eglinger, Christophe Scheffer, Kimberly Trebus, Marie Bitte, Benjamin Rondeau, Constantinos Mavrogonatos, Ian Graham, Marius Etienne, et al. To cite this version: Alexandre Tarantola, Panagiotis Voudouris, Aurélien Eglinger, Christophe Scheffer, Kimberly Tre- bus, et al.. Metamorphic and Metasomatic Kyanite-Bearing Mineral Assemblages of Thassos Island (Rhodope, Greece). Minerals, MDPI, 2019, 10.3390/min9040252. hal-02932247 HAL Id: hal-02932247 https://hal.archives-ouvertes.fr/hal-02932247 Submitted on 7 Sep 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. minerals Article Metamorphic and Metasomatic Kyanite-Bearing Mineral Assemblages of Thassos Island (Rhodope, Greece) Alexandre Tarantola 1,* , Panagiotis Voudouris 2 , Aurélien Eglinger 1, Christophe Scheffer 1,3, Kimberly Trebus 1, Marie Bitte 1, Benjamin Rondeau 4 , Constantinos Mavrogonatos 2 , Ian Graham 5, Marius Etienne 1 and Chantal Peiffert
    [Show full text]
  • KYANITE Al2sio5 a Common Metamorphic Mineral Found Primarily in Regionally Metamorphosed Intermediate-Grade Rocks Derived from Shales
    KYANITE Al2SiO5 A common metamorphic mineral found primarily in regionally metamorphosed intermediate-grade rocks derived from shales. It is less common in some veins and pegmatites. Kyanite is very rare in Michigan. It sometimes occurs as a detrital accessory mineral in glacial sands. Northern and Southern Peninsulas. Genesee County: SW ¼ NW ¼ section 6, T8N, R7E: As a detrital accessory in glacial lake sand in a water well (Stewart, 1937). Iron County: The Lake Ellen kimberlite, SW ¼ section 27, T44N, R31W, contains a variety of megacrysts, xenocrysts, and xenoliths (Cannon and Mudrey, 1981; McGee and Hearn, 1983; McGee, 1984; Hearn and McGee, 1985). About 85% of the upper mantle xenoliths collected are eclogites with granulitic textures. Most of these contain only garnet, clinopyroxene, and rutile, but some also have kyanite + sanidine + corundum + sulfides. The very pale blue-to-white kyanite is in 1 mm blades. In one specimen these have a subparallel orientation. An analysis is given in McGee and Hearn (1983). The presence of kyanite in the eclogite xenoliths indicates pressures were at least 18 to 20 kb (kimberlite). Marquette County: Champion mine on 36th level drift. Sky-blue kyanite has been reported in association with coarse, massive andalusite, and orthoclase, muscovite, quartz, biotite, and chlorite (Babcock, 1966a, b). At least one such specimen, however, has been shown by X-ray diffraction to be blue corundum (q.v.). Menominee County: Site 73 kimberlite, north of Hermansville: Small pale blue kyanite crystals have been recovered from heavy mineral concentrates produced from this kimberlite (S. M. Carlson, written communication, 1997). FROM: Robinson, G.W., 2004 Mineralogy of Michigan by E.W.
    [Show full text]
  • Singapore Tariff Schedule
    Annex 2C Tariff Schedule of Singapore See General Notes to Annex 2C for an explanation of staging codes Staging Heading H.S. Code Description Base Rates Category Chapter 1 Live animals 01.01 Live horses, asses, mules and hinnies. 0101.10.00 - Pure-bred breeding animals Free E 0101.90 - Other: 0101.90.10 - - Race horses Free E 0101.90.20 - - Other horses Free E 0101.90.90 - - Other Free E 01.02 Live bovine animals. 0102.10.00 - Pure-bred breeding animals Free E 0102.90 - Other: 0102.90.10 - - Oxen Free E 0102.90.20 - - Buffaloes Free E 0102.90.90 - - Other Free E 01.03 Live swine. 0103.10.00 - Pure-bred breeding animals Free E - Other: 0103.91.00 - - Weighing less than 50 kg Free E 0103.92.00 - - Weighing 50 kg or more Free E 01.04 Live sheep and goats. 0104.10 - Sheep: 0104.10.10 - - Pure-bred breeding Free E 0104.10.90 - - Other Free E 0104.20 - Goats: 0104.20.10 - - Pure-bred breeding animals Free E 0104.20.90 - - Other Free E Live poultry, that is to say, fowls of the species Gallus domesticus, 01.05 ducks, geese, turkeys and guinea fowls. - Weighing not more than 185 g: 0105.11 - Fowls of the species Gallus domesticus: 0105.11.10 - - - Breeding fowls Free E 0105.11.90 - - - Other Free E 0105.12 - - Turkeys: 0105.12.10 - - - Breeding turkeys Free E 0105.12.90 - - - Other Free E 0105.19 - - Other: 0105.19.10 - - - Breeding ducklings Free E 0105.19.20 - - - Other ducklings Free E 0105.19.30 - - - Breeding goslings Free E 0105.19.40 - - - Other goslings Free E 0105.19.50 - - - Breeding guinea fowls Free E 0105.19.90 - - - Other Free E - Other: 2C-Schedule-1 Staging Heading H.S.
    [Show full text]
  • Kyanite-, Staurolite-, and Garnet-Bearing Schists in the Setters Formation, Maryland Piedmont
    GEORGE W. FISHER Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, Maryland 21218 Kyanite-, Staurolite-, and Garnet-Bearing Schists in the Setters Formation, Maryland Piedmont ABSTRACT The (Setters Formation) is a fine-grained, somewhat saccharoidal, thin bedded rock of white or cream color Reconnaissance studies of the Setters Forma- in its typical development along Setters ridge ... the tion, the basal unit of the Glenarm Series, con- beds are usually separated by thin films of muscovite or firm early reports that kyanite, Staurolite, and sericite in small sparkling flakes. On the (bedding planes) are black tourmalines . locally the rock may become abundant garnets occur in the schists at the top very vitreous and massive ... at other times the rock of the formation, and refute recent statements becomes more argillaceous, with a development of to the contrary. Kyanite, Staurolite, and garnets (and) Staurolite. garnet are most abundant in the Setters schist north of Texas, Maryland. South of that point, Similarly, Mathews and Miller (1905, p. 355) the schist contains little or no kyanite or state that part of the Setters at the east end of Staurolite, and only rare garnet, possibly re- the Towson Dome is unlike that at the type flecting a change in sedimentary facies. locality, and it "shows the development of more mica with accessory garnets and oc- INTRODUCTION casional cyanite." The Setters Formation is the basal formation Miller (1905) mapped these aluminous of the Glenarm Series, a thick sequence of late schists as an informal pseudo-Wissahickon Precambrian or early Paleozoic metasediments schist member of the Setters, and showed that which underlies much of the Maryland they were confined to the upper part of the Piedmont (Fig.
    [Show full text]
  • Kyanite Petrogenesis in Migmatites: Resolving Melting and Metamorphic Signatures This Manuscript Has Been Submitted for Publicat
    Kyanite petrogenesis in migmatites: Resolving melting and metamorphic signatures Stacy E. Phillips1,2*, Tom W. Argles1, Clare J. Warren1, Nigel B.W. Harris1, Barbara E. Kunz1 1School of Earth, Environment and Ecosystems Sciences, The Open University, Milton Keynes MK7 6AA, UK 2Current address: Department of Geography, Geology and Environment, University of Hull, Hull, HU6 7RX, UK Keywords: Kyanite, Migmatite, Trace elements, LA-ICP-MS, Cathodoluminescence *Feel free to contact lead author with any comments or feedback via email: [email protected], or on Twitter: @Shtacy_Phillips This manuscript has been submitted for publication in Contributions to Mineralogy and Petrology. This manuscript has not undergone peer review. Subsequent versions of this manuscript may have revised content. If accepted, the final version of this manuscript will be available via the ‘Peer-reviewed Publication DOI’ link on the right- hand side of this webpage. Please feel free to contact any of the authors; we welcome feedback. Non-peer reviewed EarthArXiv preprint (submitted to Contributions to Mineralogy and Petrology) Kyanite petrogenesis in migmatites: Resolving melting and metamorphic signatures Stacy E. Phillips1,2*, Tom W. Argles1, Clare J. Warren1, Nigel B.W. Harris1, Barbara E. Kunz1 1School of Earth, Environment and Ecosystems Sciences, The Open University, Milton Keynes MK7 6AA, UK 2Current address: Department of Geography, Geology and Environment, University of Hull, Hull, HU6 7RX, UK *Corresponding author: [email protected] Keywords: Kyanite, Migmatite, Trace elements, LA-ICP-MS, Cathodoluminescence Abstract Aluminosilicates (kyanite, sillimanite and andalusite) are useful pressure-temperature (P-T) indicators that can form in a range of rock types through different mineral reactions, including those that involve partial melting.
    [Show full text]
  • GEMSTONES with ALEXANDRITE EFFECT by E
    GEMSTONES WITH ALEXANDRITE EFFECT By E. Gubelin and K. Schmetzer The term alexandrite effect refers to the he alexandrite effect was observed for the first time apparent change of color in certain T in 1830, in a chromium-bearing variety of chryso- minerals from blue-green or greenish beryl from the emerald mines on the eastern slopes of the violet in daylight to red or reddish violet Ural Mountains. The new gem was named by the Swed- in incandescent light. This effect was ish explorer Nils Nordenskiold in 1838 (Koksharov, 1861), discovered in chrome-bearing chrysoberyl in honor of then-Tsarevitch Alexander Nikolayevitch, from the Ural Mountains as early as the beginning of the 19th century. In more the future Tsar Alexander I1 (1818-1881). The alexandrite, recent time's, it has also been observed in famous for its conspicuous change of color-green in day- certain varieties of garnet, corundum, light and red in incandescent light-soon enjoyed great spinel, kyanite, fluorite, and monazite. It popularity as well. This gem was appreciated not only for has been determined that the absorption its curious color change, which has only very recently spectrum of all alexandrite-like minerals been explained (Carstens, 1973; Hassan et al., 1974; is characterized by transmission maxima Gubelin, 1976 a and b; and Schmetzer et al., 1980 a and in the blue-green and red regions and by b) but also because red and green were the colors of the a transmission minimum in the yellow tsarist army; thus the alexandrite was considered by many region. The color of minerals with two to be the national gem of tsarist Russia.
    [Show full text]
  • KYANITE-GARNET GEDRITITE NEAR OROFINO, IDAHO* ANNI Hrbranrn, U
    THE AMERICAN MINERAIOGIST, VOL. 44, MAY_JUNE, 1959 KYANITE-GARNET GEDRITITE NEAR OROFINO, IDAHO* ANNI HrBraNrN, U. S. GeologicalSuraey, Menlo Park, Californio. ABSTRACT In Clearwater County, Idaho, kyanite is found with amphibole in two rock types, (1) in kyanite-garnet gedritite near Orofino and (2) in hornblende-bearing iayers of anorthosite in the Boehls Butte quadrangle. The associated rocks near Orofilo are garnetiferous biotite gneisses,hornblende-biotite gneiss, garnet amphibolites, quartzites, and lime-silicate rocks of sedimentary origin. The major constituents in the kvanite-garnet gedritite are gedrite (38 per cent), quartz (26 per cent), oligoclase (16 per cent), and garnet (14 per cent). One to two per cent of kyanite in light bluish crystals is scattered throughout the rock. The formula of the gedrite calculated from the chemical analysis is (K6 s1Na6eoCao ooMg:.soFe 1.57Mn 6.6aTi" e.e7Pe.61Feo olAlno)>:z ca (Sie.nA1r.or)>-r. oo(On.ro(OH)r.s0) >:2a. 00. The garnet consists of about 49 per cent almandite and 43 per cent pyrope with some spessartite, grossularite, and andradite The texture suggests that gedrite and garnet crystallized later than the other minerals. The chemical analysis of the gedritite shows more than 15 per cent Al:Or, about 8.5 per cent each of FeO and MgO, but only 0.2 per cent K2O and 1.7 per cent CaO. The hornblende- and kyanite-bearing layers of the anorthosite are described briefly for comparison. The kyanite in these layers is a relict mineral, inherited from the schist that formerly occupied the area now covered by anorthosite.
    [Show full text]
  • The Geology and Genesis of Gem Corundum Deposits
    See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/271198687 The Geology and Genesis of Gem Corundum Deposits Chapter · February 2014 CITATIONS READS 23 2,308 5 authors, including: Daniel Ohnenstetter A.E. Fallick Centre de Recherches Pétrographiques et Géochimiques University of Glasgow 141 PUBLICATIONS 2,788 CITATIONS 713 PUBLICATIONS 16,465 CITATIONS SEE PROFILE SEE PROFILE Andrew Fagan University of British Columbia - Vancouver 10 PUBLICATIONS 36 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: minerals from Latium View project no title View project All content following this page was uploaded by A.E. Fallick on 11 July 2018. The user has requested enhancement of the downloaded file. GIULIANI ET AL. GEM CORUNDUM CHAPTER 2: THE GEOLOGY AND GENESIS OF GEM CORUNDUM DEPOSITS Gaston Giuliani1, 2, Daniel Ohnenstetter2, Anthony E. Fallick3, Lee Groat4, Andrew J. Fagan5,4 1 Université Paul Sabatier, GET, UMR 5563 CNRS-IRD-CNES-UPS, 14 avenue Edouard Belin, 31400- Toulouse, France; e-mail: [email protected] 2 Université de Lorraine, CRPG, UMR 7358 CNRS-UL, BP 20, 54501- Vanduvre-lès-Nancy cedex, France 3 Scottish Universities Environmental Research Centre, Rankine Avenue, East Kilbride, Glasgow G75 0QF, Scotland, UK 4 Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada 5 True North Gems Inc., Vancouver, BC, Canada INTRODUCTION The aim of this review is to present the state of ratnaraj, queen of precious stones and symbol of the art on the geology and genesis of gem corundum permanent internal fire.
    [Show full text]
  • NMGMS the Nugget Volume 17 Issue 10 March 2018
    Volume 17 Issue 10 March 13, 2018 Photo by Alison Schuchs Nancy and Rebecca examining microfossils Notes from the President’s Desk…..March 2018 Happy 17 th birthday NMGMS! I can’t believe that it has been that long since I joined the North Mississippi Gem and Mineral Society. I was not present at the March 17, 2001 meeting, but I was among some of the first members to join the club after it was founded. It was exciting to know that a rock and mineral organization was going to be located much closer to me, since all of the other clubs were over 2 hours away. NMGMS certainly has grown since that first meeting with 13 charter members in attendance. Early on, our organization became a member of the Southeast Federation of Mineralogical Societies and the American Federation of Mineralogical Societies. Then later, the North Mississippi Gem and Mineral Society registered as a nonprofit corporation with the state of Mississippi. NMGMS also established an active junior group which participates in the “Future Rockhounds of America” badge program sponsored by AFMS. More recently, NMGMS managed to setup a lapidary workshop, and it now has several slab saws and cabochon machines in operation. In the past, some of our club members, either on their own or through scholarships, have taken classes at the William Holland School of Lapidary Arts, and through the SFMS scholarship fund, we will be sending two club members to take the cabochon class at William Holland this summer. Also over the years, our members have worked hard to build a rapport with many other clubs and organizations, through joint field trips, participating as exhibitors at various events, working with scout groups, or teaching lapidary workshops.
    [Show full text]
  • Fluid Flow and Al Transport During Quartz-Kyanite Vein Formation, Unst
    J. metamorphic Geol., 2010, 28, 19–39 doi:10.1111/j.1525-1314.2009.00851.x Fluid flow and Al transport during quartz-kyanite vein formation, Unst, Shetland Islands, Scotland C. E. BUCHOLZ AND J. J. AGUE Department of Geology & Geophysics, Yale University, New Haven, PO Box 208109, CT 06520-8109, USA ([email protected]) ABSTRACT Quartz-kyanite veins, adjacent alteration selvages and surrounding ÔprecursorÕ wall rocks in the Dalradian Saxa Vord Pelite of Unst in the Shetland Islands (Scotland) were investigated to constrain the geochemical alteration and mobility of Al associated with channelized metamorphic fluid infiltration during the Caledonian Orogeny. Thirty-eight samples of veins, selvages and precursors were collected, examined using the petrographic microscope and electron microprobe, and geochemically analysed. With increasing grade, typical precursor mineral assemblages include, but are not limited to, chlorite+chloritoid, chlorite+chloritoid+kyanite, chlorite+chloritoid+staurolite and garnet+staurolite+kyanite+chlori- toid. These assemblages coexist with quartz, white mica (muscovite, paragonite, margarite), and Fe-Ti oxides. The mineral assemblage of the selvages does not change noticeably with metamorphic grade, and consists of chloritoid, kyanite, chlorite, quartz, white mica and Fe-Ti oxides. Pseudosections for selvage and precursor bulk compositions indicate that the observed mineral assemblages were stable at regional metamorphic conditions of 550–600 °C and 0.8–1.1 GPa. A mass balance analysis was performed to assess the nature and magnitude of geochemical alteration that produced the selvages adjacent to the veins. On average, selvages lost about )26% mass relative to precursors. Mass losses of Na, K, Ca, Rb, Sr, Cs, Ba and volatiles were )30 to )60% and resulted from the destruction of white mica.
    [Show full text]