IMA 2019-021 = maletoyvayamite

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Marco E. Ciriotti
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IMA 2019-021 = maletoyvayamite

Messaggio da Marco E. Ciriotti » mer 22 gen, 2020 14:20

Prossima pubblicazione.

Referenza:
▪ Tolstykh, N.D., Tuhý, M., Vymazalová, A., Plášil, J., Laufek, F., Kasatkin, A.V., Nestola, F., Bobrova, O.V. (2020): Maletoyvayamite, Au3Se4Te6, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia. Mineralogical Magazine, 84, (in press).

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 directly associates in intergrowths with native gold (Au-Ag), Au-tellurides (calaverite), unnamed phases (AuSe, Au2TeSe, Au-oxide), native tellurium, sulfosalts (tennantite, tetrahedrite, goldfieldite, watanabeite) and supergene tripuhyite. Maletoyvayamite has a good cleavage on {010} and {001}. In plane-polarized 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; 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 P–1, 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 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 XRD study and Raman spectroscopy. The proposed mineral is named after its type locality, the Maletoyvayam deposit in Kamchatka peninsula, Russia.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 26570
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2019-021 = maletoyvayamite

Messaggio da Marco E. Ciriotti » gio 26 mar, 2020 17:38

Pubblicazione effettuata.

Referenza:
▪ Tolstykh, N.D., Tuhý, M., Vymazalová, A., Plášil, J., Laufek, F., Kasatkin, A.V., Nestola, F., Bobrova, O.V. (2020): Maletoyvayamite, Au3Se4Te6, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia. Mineralogical Magazine, 84, 117-123.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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