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topaz

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Journal Article
Journal: Economic Geology
Published: 01 March 2021
Economic Geology (2021) 116 (2): 453–469.
...Peter J. Pollard Abstract The Yichun Ta-Sn-Li deposit occurs within the 9.5-km 2 Yashan Igneous Complex, which is made up of felsic, peraluminous intrusions including two-mica, Li-mica, and topaz-lepidolite granites. The topaz-lepidolite granite forms a thin sheet confined to the upper part...
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Journal Article
Published: 01 May 2020
The Canadian Mineralogist (2020) 58 (3): 293–311.
.... The results also indicated that zoning is better retained in larger grains ( i.e ., > 500 × 500 μm) with minimal alteration and mineral inclusions. An exceptionally well-zoned Li-rich siderophyllite from the Pleasant Ridge topaz granite in southwestern New Brunswick shows Ti, Ta, Sn, W, Cs, Rb, and V...
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Journal Article
Published: 01 November 2019
American Mineralogist (2019) 104 (11): 1656–1662.
...Earl F. O'Bannon, III; Quentin Williams Abstract Topaz [Al 2 SiO 4 (F,OH) 2 ] is a subduction-related mineral that is found in metasediments and has a large pressure and temperature stability field. Here, we use luminescence spectroscopy of Cr 3+ to probe the Al site in topaz at pressures up to ~60...
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Journal Article
Published: 30 September 2019
The Canadian Mineralogist (2019) 57 (5): 727–730.
...Donald A. Dallaire; James W. Nizamoff Topaz occurs in many worldwide pegmatites including Brazil, Pakistan, Ukraine, Russia and a host of others that find their way into the worldwide mineral market. New Hampshire is rarely mentioned even though specimen (and gem) production began in the late...
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Journal Article
Published: 01 August 2018
American Mineralogist (2018) 103 (8): 1228–1252.
... 2017 16 4 2018 Copyright © 2018 by the Mineralogical Society of America 2018 Mineralogical Society of America Spor Mountain partition coefficients beryllium fractional crystallization topaz rhyolite fluorine From Magmas to Ore Deposits Beryllium is one of the lightest...
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Journal Article
Journal: Elements
Published: 01 April 2018
Elements (2018) 14 (2): 75.
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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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Journal Article
Published: 01 February 2017
American Mineralogist (2017) 102 (2): 347–356.
...Gianfranco Ulian; Giovanni Valdrè Abstract In this work, we modeled the structure, the compressional behavior and the physical properties of topaz over six different fluorine contents and a wide range of pressure, using a quantum mechanical approach based on periodic boundary conditions. We adopted...
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Book Chapter

Author(s)
Kyaw Thu, Khin Zaw
Published: 01 January 2017
DOI: 10.1144/M48.23
EISBN: 9781862399730
... gemstones from primary deposits include spinel in marble (Mogok), peridot in dunite/peridotite (Mogok), topaz, aquamarine, tourmaline, quartz, etc. in pegmatite (Mogok, Mong Hsu and Momeik) and kyanite in quartzite (Moehnyin). Rare gemstones are often found in primary gem deposits in the Mogok Stone...
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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 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 October 2012
Russ. Geol. Geophys. (2012) 53 (10): 1077–1089.
.... Very high contents of F, rare alkali metals, Sn, Be, and W, characteristic of MTD granitoids, are close only to those in greisens of rare-metal granites and topaz-lepidolite-albitic pegmatites. The difference from the greisens in each case might be due to the features of the original rocks...
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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
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
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 October 2011
European Journal of Mineralogy (2011) 23 (5): 779–794.
..., chloritoid, clinoenstatite, clinozoisite, cordierite, cummingtonite-grunerite, diopside-hedenbergite, enstatite-ferrosilite, epidote, forsterite-fayalite, johannsenite, natrolite, piemontite, pigeonite, protoenstatite, pumpellyite, pyroxmangite, quartz, titanite, spodumene, staurolite, topaz, tourmaline...
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