IMA 2016-040 = anatolyite

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Marco E. Ciriotti
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IMA 2016-040 = anatolyite

Messaggio da Marco E. Ciriotti » sab 23 feb, 2019 14:46

Prossima pubblicazione.

▪ Pekov, I.V., Lykova, I.S., Yapaskurt, V.O., Belakovskiy, D.I., Turchkova, A.G., Britvin, S.N., Sidorov, E.G., Katharina S. Scheidl, K.S. (2019): New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XI. Anatolyite, Na6(Ca,Na)(Mg,Fe3+)3Al(AsO4)6. MIneralogical Magazine, 82, (in press).

The new mineral anatolyite Na6(Ca,Na)(Mg,Fe3+)3Al(AsO4)6 was found in the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. It is associated with potassic feldspar, hematite, tenorite, cassiterite, johillerite, tilasite, ericlaxmanite, lammerite, arsmirandite, sylvite, halite, aphthitalite, langbeinite, anhydrite, wulffite, krasheninnikovite, fluoborite, pseudobrookite, and fluorophlogopite. Anatolyite occurs as aggregates (up to 2 mm across) of rhombohedral-prismatic, equant or slightly elongated along [001] crystals up to 0.2 mm. The mineral is transparent, pale brownish-pinkish, with vitreous lustre. It is brittle, cleavage was not observed, the fracture is uneven. The Mohs’ hardness is ca 4½. Dcalc is 3.872 g cm-3. Anatolyite is optically uniaxial (–), ω = 1.703(4), ε = 1.675(3). Chemical composition (wt.%, electron microprobe) is: Na2O 16.55, K2O 0.43, CaO 2.49, MgO 5.80, MnO 0.16, CuO 0.69, ZnO 0.55, Al2O3 5.01, Fe2O3 7.94, TiO2 0.18, SnO2 0.17, SiO2 0.04, P2O5 0.55, As2O5 60.75, SO3 0.03, total 101.34. The empirical formula based on 24 O apfu (assignment of constituents to positions is in accordance with the structure refinement data) is (Na5.90K0.10)Σ6.00(Ca0.50Na0.13Zn0.08Mn0.03)Σ0.74(Mg1.63Fe3+1.12Al0.15Cu0.10)Σ3.00 (Al0.96Ti0.03Sn0.01)Σ1.00(As5.97P0.09Si0.01)Σ6.07O24. Anatolyite is trigonal, R-3c, a 13.6574(10), c 18.2349(17) Å, V 2945.6(4) Å3 and Z 6. The strongest reflections of the powder XRD pattern [d,Å(I)(hkl)] are: 7.21(33)(012), 4.539(16)(113), 4.347(27)(211), 3.421(20)(220), 3.196(31)(214), 2.981(17)(223), 2.827(100)(125) and 2.589(18)(410). The crystal structure was solved from single-crystal XRD data, R = 4.77%. The structure is based on a 3D heteropolyhedral framework formed by M4O18 clusters [M(1) = Al, M(2) = (Mg, Fe3+)] linked with AsO4 tetrahedra. (Ca,Na) and Na cations centre A(1)O6 and A(2)O8 polyhedra in voids of the framework. Anatolyite is isostructural with yurmarinite. The new mineral is named in honour of the outstanding Russian crystallographer, mineralogist and mathematician Anatoly Kapitonovich Boldyrev (1883–1946).
Marco E. Ciriotti

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