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Maletoyvayamite, Au3Se4Te6, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia

Published online by Cambridge University Press:  21 January 2020

Nadhezda D. Tolstykh ,
Marek Tuhý Open the ORCID record for Marek Tuhý [Opens in a new window] ,
Anna Vymazalová Open the ORCID record for Anna Vymazalová [Opens in a new window] ,
Jakub Plášil ,
František Laufek ,
Anatoly V. Kasatkin ,
Fabrizio Nestola  and
Olga V. Bobrova
Nadhezda D. Tolstykh
Affiliation:
VS Sobolev Institute of Geology and Mineralogy, SB RAS, prosp. Akademika Koptyuga 3, 630090, Novosibirsk, Russia Novosibirsk State University, Pirogova street 1, Novosibirsk, 630090, Russia
Marek Tuhý*
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic Institute of Mineralogy, Geochemistry and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 00Prague, Czech Republic
Anna Vymazalová
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Jakub Plášil
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, 128 21 Prague 8, Czech Republic
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071Moscow, Russia
Fabrizio Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Olga V. Bobrova
Affiliation:
StekloSoyuz, Dept of raw materials, Zhuravleva 2, Moscow107023, Russia
*
*Author for correspondence: Marek Tuhy, Email: marek.tuhy@geology.cz
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Abstract

Maletoyvayamite, Au3Se4Te6, is a new mineral discovered in a heavy-mineral concentrate from the Gaching occurrence of the Maletoyvayam deposit, Kamchatka, Russia (60°19′51.87″N, 164°46′25.65″E). It forms anhedral grains (10 to 50 μm in size) and is found in intergrowths with native gold (Au–Ag), Au tellurides (calaverite), unnamed phases (AuSe, Au2TeSe and Au oxide), native tellurium, sulfosalts (tennantite, tetrahedrite, goldfieldite and watanabeite) and supergene tripuhyite. Maletoyvayamite has a good cleavage on {010} and {001}. In plane-polarised light, maletoyvayamite is grey, has strong bireflectance (grey to bluish grey), and strong anisotropy; it exhibits no internal reflections. Reflectance values for maletoyvayamite in air (Rmin,Rmax in %) are: 38.9, 39.1 at 470 nm; 39.3, 39.5 at 546 nm; 39.3, 39.6 at 589 nm; and 39.4, 39.7 at 650 nm. Sixteen electron-microprobe analyses of maletoyvayamite gave an average composition: Au 34.46, Se 16.76, Te 47.23 and S 0.84, total 99.29 wt.%, corresponding to the formula Au2.90(Se3.52S0.44)Σ3.96Te6.14 based on 13 atoms; the average of eleven analyses on synthetic analogue is: Au 34.20, Se 19.68 and Te 45.42, total 99.30 wt.%, corresponding to Au2.90Se4.16Te5.94. The calculated density is 7.98 g/cm3. The mineral is triclinic, space group P1, with a = 8.901(2), b = 9.0451(14), c = 9.265(4) Å, α = 97.66(3), β = 106.70(2), γ = 101.399(14)°, V = 685.9(4) Å3 and Z = 2. The crystal structure of maletoyvayamite represents a unique structure type resembling a molecular structure. There are cube-like [Au6Se8Te12] clusters linked via van der Waals interactions. The structural identity of maletoyvayamite with the synthetic Au3Se4Te6 was confirmed by powder X-ray diffraction and Raman spectroscopy.

Keywords

maletoyvayamiteAu3Se4Te6reflectancechemical compositionX-ray diffractioncrystal structureGaching Au mineralisationMaletoyvayam depositKamchatkaRussia
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 1 , February 2020 , pp. 117 - 123
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: Juraj Majzlan

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