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topaz

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Journal Article
Published: 01 August 2018
American Mineralogist (2018) 103 (8): 1228-1252.
... and the younger Topaz Mountain Rhyolite ( Fig. 1 ). The Spor Mountain Formation consists of rhyolite plugs, lava flows, and cogenetic tuff, which erupted ∼21.7 m.y. ago onto Paleozoic sedimentary rock, chiefly limestone and dolomite, and the older, mid-Cenozoic volcanic rocks ( Lindsey 1979 ; Adams et al. 2009...
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Journal Article
Journal: Elements
Published: 01 April 2018
Elements (2018) 14 (2): 75.
FIGURES
Journal Article
Published: 28 February 2018
Mineralogical Magazine (2018) 82 (4): 943-960.
...Teodoro Gauzzi; Leonardo Martins Graça; Leonardo Lagoeiro; Isolda De Castro Mendes; Gláucia Nascimento Queiroga ABSTRACT A study of the cathodoluminescence (CL) properties of imperial topaz from Ouro Preto region (Minas Gerais state, Brazil) and its relation with trace-element composition...
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Journal Article
Published: 28 February 2018
Mineralogical Magazine (2018) 82 (4): 863-876.
... intersecting highly fractionated, topaz–zinnwaldite S-type leucogranite. Fluorarrojadite-(BaNa) is associated with fluorapatite, ‘fluordickinsonite-(BaNa)’, triplite, viitaniemiite and minor amounts of other minerals. It forms fine-grained irregular aggregates up to 4 cm x 2 cm, which consist of individual...
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Journal Article
Published: 01 March 2017
European Journal of Mineralogy (2017) 29 (1): 35-52.
... concentrations. The granites exhibit a light pink colour and contain mainly albite, quartz, muscovite, lithian muscovite, and lepidolite, with minor amounts of amblygonite–montebrasite, herderite, fluorapatite, topaz, and cassiterite, as well as accessory beryl and goyazite. Electron microprobe analyses...
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Book Chapter

Author(s)
Kyaw Thu, Khin Zaw
Series: Geological Society, London, Memoirs
Published: 01 January 2017
DOI: 10.1144/M48.23
EISBN: 9781862399730
... green Radioactive 72 Topaz Orthorhombic Al 2 (F,OH) 2 SiO 4 Colourless, light brownish-yellow, yellow, orangy yellow 73 Tourmaline Trigonal Na, Li, Al borosilicate (a) Elbaite: pink, reddish-pink, purplish-pink, green, yellow, white, purple Trigonal Na, Mg, Al, Fe borosilicate (b...
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Journal Article
Published: 01 December 2016
Mineralogical Magazine (2016) 80 (7): 1273-1289.
... using electron probe microanalyses. Zircons from the biotite and tourmaline granites are poor in minor and trace elements, usually containing 1.0–1.5 wt.% HfO 2 , <0.5 wt.% UO 2 and P 2 O 5 , <0.25 wt.% Y 2 O 3 , <0.2 wt.% Sc 2 O 3 and Bi 2 O 3 and <0.1 wt.% ThO 2 . Zircon from topaz...
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Journal Article
Published: 01 August 2016
Mineralogical Magazine (2016) 80 (5): 881-899.
...Andrea Agangi; Arnold Gucsik; Hirotsugu Nishido; Kiyotaka Ninagawa; Vadim S. Kamenetsky Abstract In order to define the cathodoluminescence (CL) properties of magmatic topaz and its relation with trace-element composition, we studied topaz phenocrysts from the Ary-Bulak ongonite massif, Russia...
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Journal Article
Published: 01 July 2016
The Canadian Mineralogist (2016) 54 (4): 971-987.
... (Sek-II) occur in a blocky unit. Sek-II is partly replaced by biotite, muscovite, chlorite, schorl, and minor to trace zinnwaldite, beryl, albite, fluorapatite, calcite, topaz, and several accessory Nb,Ta,Ti-oxides and sulfides, and late smectite. Rather heterogeneous Sek-II (Sek 71–75 MnCrd 23–28 Crd...
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Journal Article
Published: 01 June 2015
Mineralogical Magazine (2015) 79 (3): 767-780.
..., ‘biotite’, muscovite, cryolite, zircon, polylithionite, cassiterite, pyrochlore-group minerals, ‘columbite’, thorite, native lead, hematite, galena, fluorite, xenotime-(Y), gagarinite-(Y), fluocerite-(Ce), genthelvite–helvite, topaz, ‘illite’, kaolinite and ‘chlorite’. The mineral occurs as massive...
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Journal Article
Published: 01 August 2014
Mineralogical Magazine (2014) 78 (4): 1029-1041.
... that is zoned compositionally from high-silica rhyolite to latite. During cooling of the tuff, escaping vapour produced lithophysae (former gas cavities) lined with an assemblage of tridymite (commonly inverted to cristobalite or quartz), sanidine and locally, hematite and/or garnet. Vapour-phase topaz...
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Journal Article
Published: 01 June 2014
Mineralogical Magazine (2014) 78 (3): 507-533.
...I. Petrík; Š. Čík; M. Miglierini; T. Vaculovič; I. Dianiška; D. Ozdín Abstract Lithium micas of the zinnwaldite and phengite–Li-phengite series occur as characteristic minerals in Permian Li-F-(P) granites of the western Gemeric unit (Western Carpathians) accompanied by topaz, tourmaline, Nb, Ta...
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Journal Article
Published: 01 June 2013
Mineralogical Magazine (2013) 77 (4): 403-417.
...K. Breiter; N. Gardenová; T. Vaculovič; V. Kanický Abstract The composition of topaz from different granites and greisen in the Krušné Hory/Erzgebirge area was investigated using electron microprobe analysis (EMPA) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). All...
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Journal Article
Published: 01 December 2012
The Canadian Mineralogist (2012) 50 (6): 1515-1530.
... and Ta from Nb observed in the Brunswick pegmatite field is characteristic of F-poor environments in general, and of F-enriched pegmatites with high μHF/μalkF (stability field of topaz). However, the extensive Fe–Mn fractionation preceding moderate to strong enrichment in Ta is typical of the Oxford...
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Journal Article
Published: 01 August 2012
The Canadian Mineralogist (2012) 50 (4): 805-814.
... Nala are albite, quartz, K-feldspar, tourmaline, muscovite or lepidolite, topaz and fluorite, and billwiseite can be partly mantled by B-rich muscovite. Billwiseite is monoclinic, space group C 2/ c , a 54.116(5), b 49143(5), c 5.5482(5) Å, β 90.425(2)°, V 1475.5(2) Å 3 , Z = 4, a:b:c = 11.012 : 1...
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Journal Article
Published: 01 August 2012
American Mineralogist (2012) 97 (8-9): 1452-1459.
... curves among topaz, andalusite, muscovite, pyrophyllite, AlF 3 , and K n AlF 3+n built from our experiments, which have allowed us to determine the topaz stability field. Topaz is stable in solutions with HF concentrations from 3·10 −3 to 8·10 −1 m and with KF concentrations lower than 7.5·10 −3 m...
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Journal Article
Journal: Elements
Published: 01 August 2012
Elements (2012) 8 (4): 281-287.
...William B. Simmons; Federico Pezzotta; James E. Shigley; Hartmut Beurlen Abstract Pegmatites are sources of gem-quality crystals of beryl, tourmaline, topaz, spodumene, and spessartine. Historic localities are found in Brazil, Madagascar, Russia, and the United States, but important deposits have...
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Journal Article
Published: 01 April 2011
The Canadian Mineralogist (2011) 49 (2): 521-540.
... occidentales, en République Slovaque, et à d’autres petits massifs de granite de type S géochimiquement spécialisés et enrichis en F et B. A part du topaze phénocristique et de la zinnwaldite, la matrice du microgranite contient un assemblage caractéristique d’aluminophosphates rares (arrojadite...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2010
GSA Bulletin (2010) 122 (1-2): 253-264.
... postkinematic circular to ovoid plutons are the most abundant of this compositional group, and many show rapakivi textures. A second, more felsic group has much higher light (L) to heavy (H) rare earth element (REE) ratios. The third group is highly fractionated, contains topaz locally, is enriched in Rb, Nb...
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Journal Article
Published: 01 December 2009
The Canadian Mineralogist (2009) 47 (6): 1359-1374.
...Sari Lukkari; Rainer Thomas; Ilmari Haapala Abstract The crystallization of the late-stage F-enriched Kymi topaz granite, in southeastern Finland, has been investigated by remelting and analyzing crystallized melt inclusions in quartz and topaz grains from porphyritic and equigranular topaz...
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