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Journal Article
Published: 01 September 2023
American Mineralogist (2023) 108 (9): 1573–1596.
... an exceptional opportunity to test hypotheses related to the origin of F-rich, highly silicic magmas because it hosts numerous Climax-type deposits and porphyry Mo prospects ( Fig. 1a ), as well as topaz rhyolites and fluorite-bearing leucogranites. This study tests inferences regarding the origins of F-rich...
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Journal Article
Published: 01 November 2022
American Mineralogist (2022) 107 (11): 2075–2083.
...Kako Aradachi; Morihisa Hamada; Kiyoshi Tsuge; Tohru Watanabe Abstract Topaz, Al 2 SiO 4 (OH) x F (2– x ) , may play a significant role in transporting water and fluorine into the Earth’s interior at subduction zones. Seismological detection of topaz gives us insights into the transport mechanisms...
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Journal Article
Published: 01 February 2022
American Mineralogist (2022) 107 (2): 233–238.
... and in beryl from the Morrua Mine, both in the Alto Ligonha District, Mozambique, and a calcite-group carbonate and whewellite [CaC 2 O 4 ∙H 2 O] in fluid inclusions in topaz from Khoroshiv, Ukraine. The occurrence of oxalate is interpreted to be due to a reaction of some form of carbon (possibly CO or bitumen...
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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.
... systems. They can be further classified as peraluminous A1-type with a within plate granite signature ( Figs. 4 and 5 ). Topaz is a rare accessory mineral in cavities in pegmatite dikes and pods in New Hampshire ( Fig. 6 ). Conditions favoring topaz formation are peraluminous bulk composition...
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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...
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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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Book Chapter

Series: Short Courses
Published: 01 January 2014
DOI: 10.3749/9780921294696.ch08
EISBN: 978-0-921294-69-6
...INTRODUCTION Topaz is a common gemstone that is found on all continents ( Fig. 8-1 ). It is an aluminum fluorosilicate (Al 2 SiO 4 F 2–x (OH) x ) with a hardness of 8 and a wide range of colors. The name topaz, according to Pliny, is probably derived from either the Greek or Latin words...
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Series: Short Courses
Published: 01 January 2014
DOI: 10.3749/9780921294696.ch11
EISBN: 978-0-921294-69-6
..., direct exploration by mining companies and prospectors has been responsible for many new gem finds, including sapphire in Nunavut, emerald in the Yukon and Ontario, and peridot, topaz and aquamarine in British Columbia. Wight (1999b) documented some of the early successes of this new wave...
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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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