Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia
The new mineral amgaite was discovered at the Khokhoyskoe gold deposit, 120 km W of Aldan town, Aldanskiy District, Sakha Republic (Yakutia), Eastern Siberia, Russia. Amgaite forms fine-grained colloform aggregates up to 0.05 mm across, and is often intimately intergrown with avicennite, unidentifie...
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ftmdpi:oai:mdpi.com:/2075-163X/12/9/1064/ 2023-08-20T04:09:29+02:00 Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia Anatoly V. Kasatkin Galina S. Anisimova Fabrizio Nestola Jakub Plášil Jiří Sejkora Radek Škoda Evgeniy P. Sokolov Larisa A. Kondratieva Veronika N. Kardashevskaia agris 2022-08-24 application/pdf https://doi.org/10.3390/min12091064 EN eng Multidisciplinary Digital Publishing Institute Mineral Deposits https://dx.doi.org/10.3390/min12091064 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 12; Issue 9; Pages: 1064 amgaite new mineral Khokhoyskoe gold deposit Amga river Raman spectroscopy chemistry synthetic Tl 3+ 2 Te 6+ O 6 trivalent thallium Text 2022 ftmdpi https://doi.org/10.3390/min12091064 2023-08-01T06:11:40Z The new mineral amgaite was discovered at the Khokhoyskoe gold deposit, 120 km W of Aldan town, Aldanskiy District, Sakha Republic (Yakutia), Eastern Siberia, Russia. Amgaite forms fine-grained colloform aggregates up to 0.05 mm across, and is often intimately intergrown with avicennite, unidentified carbonates and antimonates of Tl. Other associated minerals include gold, silver, acanthite, arsenopyrite, pyrite, berthierite, chalcocite, weissbergite, chlorargyrite, calcite, quartz, goethite etc. Amgaite is dark reddish brown to black. It has submetallic luster, black streak, brittle tenacity and conchoidal fracture. Its density calculated from the empirical formula and powder XRD data is 8.358 g/cm3. Its Mohs’ hardness is ca. 1.5–2. Optically, amgaite is uniaxial. In reflected light, it is gray with a bluish shade, very weakly anisotropic with rare brownish red internal reflections. Reflectance values for the four COM wavelengths [Rmin, Rmax (%)(λ in nm)] are: 13.5, 14.2 (470); 12.7, 13.2 (546); 12.3, 12.7 (589); and 11.7, 12.3 (650). The Raman spectrum shows bands of Te–O and Tl–O bonds and confirms the absence in amgaite of H2O, OH–, CO32– groups and B–O bonds. The chemical composition is (electron microprobe, wt.%): MgO 0.43, CaO 1.62, Fe2O3 0.36, Tl2O3 66.27, Sb2O5 3.48, TeO3 27.31, total 99.47. The empirical formula based on 6 O apfu is Tl3+1.74Ca0.17Mg0.06Fe3+0.03Te6+0.93Sb5+0.13O6. Amgaite is trigonal, space group P321; unit-cell parameters are as follows: a = 9.0600(9), c = 4.9913(11) Å, V = 354.82(8) Å3, Z = 3. The strongest lines of the powder X-ray diffraction pattern [dobs, Å (I, %) (hkl)] are as follows: 3.352 (100) (111), 3.063 (15) (201), 2.619 (49) (300), 2.065 (18) (221), 1.804 (28) (302), 1.697 (8) (321), 1.625 (9) (411). The crystal structure of amgaite is the same as of synthetic Tl3+2Te6+O6. The new mineral is named after the Amga River, the basin of which hosts the type locality, Khokhoyskoe occurrence. The type material is deposited in the collections of the Fersman Mineralogical Museum ... Text Sakha Sakha Republic Yakutia Siberia MDPI Open Access Publishing Sakha Aldan ENVELOPE(129.546,129.546,63.447,63.447) Minerals 12 9 1064 |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
topic |
amgaite new mineral Khokhoyskoe gold deposit Amga river Raman spectroscopy chemistry synthetic Tl 3+ 2 Te 6+ O 6 trivalent thallium |
spellingShingle |
amgaite new mineral Khokhoyskoe gold deposit Amga river Raman spectroscopy chemistry synthetic Tl 3+ 2 Te 6+ O 6 trivalent thallium Anatoly V. Kasatkin Galina S. Anisimova Fabrizio Nestola Jakub Plášil Jiří Sejkora Radek Škoda Evgeniy P. Sokolov Larisa A. Kondratieva Veronika N. Kardashevskaia Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
topic_facet |
amgaite new mineral Khokhoyskoe gold deposit Amga river Raman spectroscopy chemistry synthetic Tl 3+ 2 Te 6+ O 6 trivalent thallium |
description |
The new mineral amgaite was discovered at the Khokhoyskoe gold deposit, 120 km W of Aldan town, Aldanskiy District, Sakha Republic (Yakutia), Eastern Siberia, Russia. Amgaite forms fine-grained colloform aggregates up to 0.05 mm across, and is often intimately intergrown with avicennite, unidentified carbonates and antimonates of Tl. Other associated minerals include gold, silver, acanthite, arsenopyrite, pyrite, berthierite, chalcocite, weissbergite, chlorargyrite, calcite, quartz, goethite etc. Amgaite is dark reddish brown to black. It has submetallic luster, black streak, brittle tenacity and conchoidal fracture. Its density calculated from the empirical formula and powder XRD data is 8.358 g/cm3. Its Mohs’ hardness is ca. 1.5–2. Optically, amgaite is uniaxial. In reflected light, it is gray with a bluish shade, very weakly anisotropic with rare brownish red internal reflections. Reflectance values for the four COM wavelengths [Rmin, Rmax (%)(λ in nm)] are: 13.5, 14.2 (470); 12.7, 13.2 (546); 12.3, 12.7 (589); and 11.7, 12.3 (650). The Raman spectrum shows bands of Te–O and Tl–O bonds and confirms the absence in amgaite of H2O, OH–, CO32– groups and B–O bonds. The chemical composition is (electron microprobe, wt.%): MgO 0.43, CaO 1.62, Fe2O3 0.36, Tl2O3 66.27, Sb2O5 3.48, TeO3 27.31, total 99.47. The empirical formula based on 6 O apfu is Tl3+1.74Ca0.17Mg0.06Fe3+0.03Te6+0.93Sb5+0.13O6. Amgaite is trigonal, space group P321; unit-cell parameters are as follows: a = 9.0600(9), c = 4.9913(11) Å, V = 354.82(8) Å3, Z = 3. The strongest lines of the powder X-ray diffraction pattern [dobs, Å (I, %) (hkl)] are as follows: 3.352 (100) (111), 3.063 (15) (201), 2.619 (49) (300), 2.065 (18) (221), 1.804 (28) (302), 1.697 (8) (321), 1.625 (9) (411). The crystal structure of amgaite is the same as of synthetic Tl3+2Te6+O6. The new mineral is named after the Amga River, the basin of which hosts the type locality, Khokhoyskoe occurrence. The type material is deposited in the collections of the Fersman Mineralogical Museum ... |
format |
Text |
author |
Anatoly V. Kasatkin Galina S. Anisimova Fabrizio Nestola Jakub Plášil Jiří Sejkora Radek Škoda Evgeniy P. Sokolov Larisa A. Kondratieva Veronika N. Kardashevskaia |
author_facet |
Anatoly V. Kasatkin Galina S. Anisimova Fabrizio Nestola Jakub Plášil Jiří Sejkora Radek Škoda Evgeniy P. Sokolov Larisa A. Kondratieva Veronika N. Kardashevskaia |
author_sort |
Anatoly V. Kasatkin |
title |
Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
title_short |
Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
title_full |
Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
title_fullStr |
Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
title_full_unstemmed |
Amgaite, Tl3+2Te6+O6, a New Mineral from the Khokhoyskoe Gold Deposit, Eastern Siberia, Russia |
title_sort |
amgaite, tl3+2te6+o6, a new mineral from the khokhoyskoe gold deposit, eastern siberia, russia |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/min12091064 |
op_coverage |
agris |
long_lat |
ENVELOPE(129.546,129.546,63.447,63.447) |
geographic |
Sakha Aldan |
geographic_facet |
Sakha Aldan |
genre |
Sakha Sakha Republic Yakutia Siberia |
genre_facet |
Sakha Sakha Republic Yakutia Siberia |
op_source |
Minerals; Volume 12; Issue 9; Pages: 1064 |
op_relation |
Mineral Deposits https://dx.doi.org/10.3390/min12091064 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min12091064 |
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Minerals |
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12 |
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