IMA 2022-007 = tolstykhite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

IMA 2022-007 = tolstykhite

Messaggio da Marco E. Ciriotti » lun 19 set, 2022 19:02

Prossima pubblicazione.

Referenza:
▪ Kasatkin, A.V., Nestola, F., Plášil, J., Sejkora, J., Vymazalová, A., Škoda, R. (2023): Tolstykhite, Au3S4Te6, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia. Mineralogical Magazine, 87, (in press).

Abstract:
Tolstykhite, ideally Au3S4Te6, is a new mineral from the Gaching ore occurrence of the Maletoyvayam deposit, Kamchatka peninsula, Russia. It occurs as individual anhedral grains up to 0.05 mm or as intergrowths with native Se, native Te and tripuhyite. Other associated minerals include calaverite, fischesserite, Cu-Te-rich fahlores [stibiogoldfieldite, its As-analogue, tennantite-(Cu), tetrahedrite-(Zn)], galena, gold, maletoyvayamite, minerals of famatinite–luzonite series, pyrite, baryte, ilmenite, magnetite, quartz and V-bearing rutile. Tolstykhite is bluish-gray, opaque with metallic lustre and gray streak. It is brittle and has an uneven fracture. Cleavage is good on {010}and {001}. Dcalc = 7.347 g/cm3. In reflected light, tolstykhite is gray with a bluish shade. No bireflectance, pleochroism and internal reflections are observed. In crossed polars, it is weakly anisotropic with bluish to brownish rotation tints. The reflectance values for wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are (Rmin/Rmax, %): 32.6/34.3 (470 nm), 32.4/34.1 (546 nm), 32.6/34.5 (589 nm), 33.0/35.0 (650 nm). The Raman spectrum of tolstykhite contains main bands at 297, 203, 181, 151 and 127 cm-1. The empirical formula calculated on the basis of 13 atoms pfu is (Au2.98Ag0.01)Σ2.99(S3.59Se0.41)Σ4.00Te6.01. Tolstykhite is triclinic, space group P–1, a = 8.977(5), b = 9.023(2), c = 9.342(6) Å, α = 94.03(3), β = 110.03(3), γ = 104.27(4)°, V = 679.0(3)Å3and Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 8.59 (18) (010); 2.90 (100) (0-13); 2.23 (13) (13-3); 1.89 (21) (13-4). Tolstykhite is the Sanalogue of maletoyvayamite, Au3Se4Te6. The structural identity between them is confirmed by powder X-ray diffraction and Raman spectroscopy. The mineral honors Russian mineralogist Dr. Nadezhda Dmitrievna Tolstykh for her contributions to the mineralogy of gold and platinumgroup elements and the study of ore deposits.
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2022-007 = tolstykhite

Messaggio da Marco E. Ciriotti » sab 18 feb, 2023 10:46

Pubblicazione effettuata.

Referenza:
▪ Kasatkin, A.V., Nestola, F., Plášil, J., Sejkora, J., Vymazalová, A., Škoda, R. (2023): Tolstykhite, Au3S4Te6, a new mineral from Maletoyvayam deposit, Kamchatka peninsula, Russia. Mineralogical Magazine, 87, 34-39.
Marco E. Ciriotti

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

Rispondi

Chi c’è in linea

Visitano il forum: Bing [Bot] e 52 ospiti