 | | Journal (article/letter/editorial) | | Grandidieriteof contact-metamorphic originfrom Maratakka, northwestSurinam Euoxo W. F. or Rorvnn GeologischM...pyroxene-hornfels-facies xenolithsin a gabbroicintrusion at Maratakka,northwestSurinam. Introduction Occurrence Grandidierite...body, a few kilometersin size, gabbroicbodyat Maratakka(5" 11,37,,N, 56"54,16" surroundedby granite,presumablywith...mafic data)in drill-holesamples. body consistsof quartz gabbro-noriteand biotitequartzdiorite,and is cut...the axial ditional sillimanite(with or without quartz)and lopJaneparallelto (001). Extinctionis straight |  | | Journal (article/letter/editorial) | | in two aluminous metasedimentary xenoliths from quartz-latitic volcanic rocks from Mt. Amiata and Mt....Bellaria flow (Mazzuoli and Pratesi, 1963), which is a quartz-latite perlitic lava. The xenolith is fine grained... 345. Mt. Amiata (Italy) Mt. Cimino (Italy) Maratakka (Surinam) Tizi-Ouchen (Algeria) Blanket Bay (Cuvier...tourmaline occur sporadically in an originally low-grade quartz-rich metasedimentary rock, the former only in association...aluminium-rich minerals and before feldspars and quartz (if present). The Mt. Amiata and Mt. Cimino occurrences |  | | Report (issue) | | aplites, gneisses; in xenoliths. Association: Quartz, potassic feldspar, plagioclase, biotite, garnet...on Madagascar. In the Kachebere Hills, Mchinji district, Malawi. From Tizi-Ouchen, B¶ejaia, Algeria. From...on Almjotheia, 12 km north of Moi, Norway. At Maratakka, Surinam. On Cuvier Island, New Zealand. Known |  | | Book | | SPRINGER BRIEFS IN EARTH SCIENCES Marco Keersemaker Suriname Revisited: Economic Potential of its Mineral Resources...springer.com/series/8897 Marco Keersemaker Suriname Revisited: Economic Potential of its Mineral Resources...the last employees of BHP Billiton Maatschappij Suriname, I was closely involved in the departure of my...would possibly be economic. Besides my years in Suriname, I have also spent almost a decade working on...belief that there must be hidden opportunities in Suriname. Professor Wong et al. were the last to review |  | | Journal (article/letter/editorial) | | I , J , F . and C. KIEFT: crandldlerlte from Maratakka, northwest Surlnam and C, KIEFT, E, MURRAY , E...T :U P P e r of chlorite limit stabiltty r029 + quartz unit cel1 Fluoborite, Forsterl-te structure crystal...P . see RUDERT' V. EVANS, B,W. and P. MISCH: A quartz-aragonlce-talc from the lower schlst 1005 Washlngton...e e M A N S F I E L D TC , F . Grossular, with quartz reaction see BINNS, R.A. G R O V E S ,D . I . Grunerite...oclase-garnet 8I8 anl CLay Wineyq,T,s (Thorez) A1?Sioq-quartz: a potential F A W C E T T ,J . J . geSbar5neter-geothemoneter |  | | Journal (article/letter/editorial) | | alkali-free tourmaline decomposes to grandidierite-quartz at temperatures greater than 750~ Similar results...not sapphirine + quartz), orthopyroxene, cordierite and spinel and rarely with quartz and plagioclase...an equigranular polygonal matrix of plagioclase, quartz and minor K-feldspar and biotite. The borosilicate...Fig. 3a). Grandidierite occurs in contact with quartz and plagioclase as corroded prismatic crystals...as rare symplectitic intergrowths with quartz. Retrograde quartz moats (qtz2) between grandidierite and |  | | Journal (issue) | | alluvial sapphires from Russia’s Jewish Autonomous District. 266 A New Deposit of Gem-Quality Grandidierite...inclusion in tanzanite • Mobile fluorite inclusion in quartz • Inclusions in spinel from Madagascar • Sphalerite...Tourmaline termination • Quarterly crystal: Axinite in quartz 317 Gem News International Aquamarine from a...JAPAN CHINA 0 50 km Figure 2. The Sutara mine district is located in the Jewish Autonomous Region (Russian...consist of microcline, microperthite, oligoclase, quartz, and biotite; muscovite is less common. Secondary |  | | Report (volume) | | :cceeeeeeeeeeees Tourmaline stability in magmas: Quartz-tourmaline assemblages...... Tourmaline stability...hydrous strontium borate from the Kramer Borate District, California. USGS Prof Paper 424-C:294-297 Erd...paragenesis of the Little Three mine pegmatites, Ramona District, San Diego County, California. Mineral Rec 20:101-127... from the Little Three mine pegmatite, Ramona District, San Diego County, California. Am Mineral 76:1998-2002...Vicanite-(Ce): a new borosilicate from the Vico volcanic district (Latium, Italy). Eur J Mineral 7:439-446 Ca-Th-REE | | | Report (volume) | | magmas: Dravite 376 Tourmaline stability in magmas: Quartz-tourmaline assemblages 376 Tourmaline stability...hydrous strontium borate from the Kramer Borate District, California. USGS Prof Paper 424-C:294-297 Erd...paragenesis of the Little Three mine pegmatites, Ramona District, San Diego County, California. Mineral Ree 20:101-127... from the Little Three mine pegmatite, Ramona District, San Diego County, California. Am Mineral 76:1998-2002...Ca-Th-REE borosilicate from the Vico volcanic district (Latium, Italy). Eur J Mineral 7:439-446 Matsubara |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Especially when the mineral species is common, such as quartz (75.1.3.1), many varieties (jasper, onyx) are known...chemistry and structure are identical to those of quartz. 5D. Polytypes Materials whose basic structural...only with fibrous minerals Columbite, wolframite Quartz Opal, some yellow varieties of sphalerite Nepheline...are distinctive. Chonchoidal fracture, typical of quartz, gives a fracture similar to the interior of a...Calcite 4 5 6 Fluorite Apatite Orthoclase a Quartz Soft, greasy feel like tale and graphite, and |
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