IMA 2016-103 = pansnerite

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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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IMA 2016-103 = pansnerite

Messaggio da Marco E. Ciriotti » mar 30 lug, 2019 20:04

Referenza:
▪ Pekov, I.V., Zubkova, N.V., Koshlyakova, N.N., Agakhanov, A.A., Belakovskiy, D.I., Vigasina, M.F., Yapaskurt, V.O., Britvin, S.N., Turchkova, A.G., Sidorov, E.G., Pushcharovsky, D.Y. (2020): New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIII. Pansnerite, K3Na3Fe3+6(AsO4)8. Mineralogical Magazine, 84, (in press).

Abstract:
The new mineral pansnerite, ideally K3Na3Fe3+6(AsO4)8, was found in the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with aphthitalite, hematite, sanidine, badalovite, khrenovite, achyrophanite, arsenatrotitanite, ozerovaite, tilasite, calciojohillerite, johillerite, nickenichite, svabite, katiarsite, yurmarinite, anhydrite, rutile, cassiterite, and pseudobrookite. Pansnerite forms tabular to lamellar (flattened on {010}), usually pseudo-hexagonal crystals up to 0.2 × 0.7 × 1 mm3 and crystal clusters up to 2 mm across. It is transparent to translucent, light green, pale greenish, yellowish-greenish or yellowish, with vitreous lustre. The mineral is brittle, with perfect {010} cleavage. The Mohs’ hardness is ca 3. Dcalc is 3.596 g cm-3. Pansnerite is optically biaxial (–), α 1.702(4), β 1.713(4), γ 1.717(4), 2Vmeas = 45(10)º. Chemical composition (holotype, wt.%, electron microprobe data) is: Na2O 6.39, K2O 8.52, CaO 0.08, MgO 0.08, MnO 0.02, NiO 0.02, CuO 1.35, ZnO 0.34, Al2O3 7.35, Cr2O3 0.04, Fe2O3 16.72, SiO2 0.16, P2O5 0.22, V2O5 0.09, As2O5 57.76, SO3 0.04, total 99.20. The empirical formula based on 32 O apfu is K2.86Na3.26Ca0.02(Fe3+3.31Al2.28Cu0.27Zn0.07Mg0.03Cr0.01)Σ5.97(As7.95P0.05Si0.04V0.02S0.01)Σ8.06O32. Pansnerite is orthorhombic, Cmce, a 10.7372(3), b 20.8367(8), c 6.47335(15) Å, V 1448.27(7) Å3 and Z = 2. The strongest reflections of the powder X-ray diffraction (XRD) pattern [d,Å(I)(hkl)] are: 10.49(100)(020), 5.380(88)(111), 4.793(65)(220), 3.105(46)(311, 002), 3.079(32)(112, 061), 2.932(35)(260), 2.783(65)(202) and 2.694(52)(400, 222). The crystal structure was solved from single-crystal XRD data, R = 2.82%. The structure is based on heteropolyhedral layers formed by MO6 octahedra (M = Fe3+, Al) sharing common vertices and connected by AsO4 tetrahedra. Na+ and K+ cations are located in the interlayer space. The mineral is named in honour of the German-Russian mineralogist and geographer Lavrentiy Ivanovich Pansner (1777–1851). Pansnerite forms a solid-solution series with the isotypic mineral ozerovaite, ideally KNa2Al3(AsO4)4.

ozerovaite group Z = 2
Ozerovaite (Na4K2)Al6(AsO4)8
Pansnerite (K3Na3)Fe3+6(AsO4)8
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
Contatta:

Re: IMA 2016-103 = pansnerite

Messaggio da Marco E. Ciriotti » gio 26 mar, 2020 17:39

Pubblicazione avvenuta.

Referenza:
▪ Pekov, I.V., Zubkova, N.V., Koshlyakova, N.N., Agakhanov, A.A., Belakovskiy, D.I., Vigasina, M.F., Yapaskurt, V.O., Britvin, S.N., Turchkova, A.G., Sidorov, E.G., Pushcharovsky, D.Y. (2020): New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. XIII. Pansnerite, K3Na3Fe3+6(AsO4)8. Mineralogical Magazine, 84, 143-151.
Marco E. Ciriotti

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

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