IMA 2020-033 = hasanovite

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Marco E. Ciriotti
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IMA 2020-033 = hasanovite

Messaggio da Marco E. Ciriotti » dom 26 mar, 2023 13:29

Referenza:
▪ Mirakov, M.A., Pautov, L.A., Siidra, O.I., Makhmadsharif, S., Karpenko, Y.Yu., Plechov, P. Yu. (2023): Hasanovite, KNa(MoO2)(SO4)2, a new mineral from natural underground coal fires at the Fan-Yagnob coal deposit, Tajkistan. Zapiski RMO, 152, 18-36.

Abstract:
The new mineral hasanovite KNa(MoO2)(SO4)2 was discovered in sublimates of a natural underground coal fire at the Fan-Yagnob coal deposit in the upper reaches of the Kuhi-Malik ravine in the Aini district, Central Tajikistan. The mineral is named in honor of the petrographer Abdurahim Hasanovich Hasanov (born 1933). Hasanovite occurs as small (50–200 µm) grains on a burnt siltstone in association with anhydrite, baryte, anglesite, molybdite, native tellurium, and understudied Sb-K, K-Mg, Tl-V, and Sn sulfates. The mineral is transparent, colourless with a vitreous luster and white streak. It is brittle, with no cleavage. VHN 103 (range from 84 to 113). The Mohs’ hardness is 3. Dmeas = 2.93(2) and Dcalc = 2.94 g/cm3. Hasanovite is colourless in transmitted light, pleochroism is not observed; it is optically biaxial (+), 2V = 50(3)°, α = 1.584(2), β(calc.) = 1.590(3), γ = 1.620(2) (590 nm). Strong lines in the Raman spectrum are as follows: 1034, 958, 916, 648, 469, 390, 273 and 232 cm–1. Hasanovite is insoluble in water and ethanol but soluble in HCl. The chemical composition studied by electron microprobe (wt %) is: Na2O 4.54, K2O 13.81, Tl2O 1.80, MoO3 38.75, SO3 40.10, total 99.00. The empirical formula, calculated on the basis of O = 10 atoms per formula unit, is K1.16Na0.58Tl0.03Mo1.06S1.98O10. The strongest lines in the powder X-ray diffraction pattern are [d, Å(I, %)(hkl)]: 7.30(36)(110); 6.57(48)(011); 4.34(75)(1¯21); 3.64(100)(211); 3.44(58)(031); 3.34(74)(2¯02, 022); 3.20(63)(2¯12); 2.879(73)(2¯31); 2.729(50)(140); 2.436(44)(1¯23). Hasanovite is monoclinic, space group is P21/c, a =9.6225(2), b = 11.4049(3), c = 8.1421(2) Å, β = 99.1790(10)°, V = 882.10(4) Å3, Z = 4. The crystal structure (R1 = 2.7%) is close to the structure of synthetic K2(MoO2)(SO4)2. The holotype specimen of hasanovite is deposited in the collection of the Fersman Mineralogical Museum of RAS (Moscow), registration number 5568/1.
Marco E. Ciriotti

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