IMA 2014-015 = pharmazincite

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Marco E. Ciriotti
Messaggi: 23496
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2014-015 = pharmazincite

Messaggio da Marco E. Ciriotti » mar 27 set, 2016 9:22

Prossima pubblicazione.

Referenza:
▪ Pekov, I.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Zubkova, N.V., Sidorov, E.G. (2017): New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. VII. Pharmazincite, KZnAsO4. Mineralogical Magazine, 81, (in press).

Abstract:
The new mineral pharmazincite, KZnAsO4, was found in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is closely associated with shchurovskyite, dmisokolovite, bradaczekite, arsmirandite, tilasite, johillerite, tenorite, hematite, aphthitalite and As-bearing orthoclase. Pharmazincite occurs as prismatic to acicular crystals up to 1 mm long and up to 0.03 mm thick typically combined in near-parallel, radial or chaotic intergrowths, open-work aggregates or crusts up to 2 mm across. Pharmazincite is colourless to white, transparent, with a vitreous lustre. It is brittle, with a stepped fracture and a perfect cleavage parallel to [001]. Dcalc is 4.75 g cm-3. Pharmazincite is optically uniaxial (–), ω = 1.649(2), ε = 1.642(2). The Raman spectrum is reported. The chemical composition (wt%, electron-microprobe data) is: K2O 18.98, CaO 0.14, MgO 1.20, CuO 4.41, ZnO 27.58, Fe2O3 0.15, P2O5 0.50, As2O5 46.67, total 99.63. The empirical formula, calculated based on 4 O apfu, is: (K0.97Ca0.01)Σ0.98(Zn0.82Cu0.13Mg0.07Fe3+ 0.01)Σ1.03(As0.98P0.02)Σ1.00O4. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 6.36(28)(111), 4.64(45)(220), 4.35(48)(002), 3.260(36)(411), 3.179(100)(222), 2.770(26)(113), 2.676(77)(600), 2.278(15)(602) and 1.710(15)(713, 115). Pharmazincite is hexagonal, a = 18.501(4), c = 8.7114(9) Å, V = 2582.4(8) Å3 and Z = 24 (single-crystal XRD data). Its space group is P63, by analogy with synthetic KZnAsO4 that has a crystal structure based upon a tetrahedral tridymite-type {ZnAsO4}-framework. It is isostructural with megakalsilite KAlSiO4. The new mineral is named for its chemical constituents.
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: 23496
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2014-015 = pharmazincite

Messaggio da Marco E. Ciriotti » gio 26 ott, 2017 22:15

Pubblicazione avvenuta.

Referenza:
▪ Pekov, I.V., Yapaskurt, V.O., Belakovskiy, D.I., Vigasina, M.F., Zubkova, N.V., Sidorov, E.G. (2017): New arsenate minerals from the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. VII. Pharmazincite, KZnAsO4. Mineralogical Magazine, 81, 1001-1008.

Abstract:
The new mineral pharmazincite, KZnAsO4, was found in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is closely associated with shchurovskyite, dmisokolovite, bradaczekite, arsmirandite, tilasite, johillerite, tenorite, hematite, aphthitalite and As-bearing orthoclase. Pharmazincite occurs as prismatic to acicular crystals up to 1 mm long and up to 0.03 mm thick typically combined in near-parallel, radial or chaotic intergrowths, open-work aggregates or crusts up to 2 mm across. Pharmazincite is colourless to white, transparent, with a vitreous lustre. It is brittle, with a stepped fracture and a perfect cleavage parallel to [001]. Dcalc is 4.75 g cm-3. Pharmazincite is optically uniaxial (–), ω = 1.649(2), ε = 1.642(2). The Raman spectrum is reported. The chemical composition (wt%, electron-microprobe data) is: K2O 18.98, CaO 0.14, MgO 1.20, CuO 4.41, ZnO 27.58, Fe2O3 0.15, P2O5 0.50, As2O5 46.67, total 99.63. The empirical formula, calculated based on 4 O apfu, is: (K0.97Ca0.01)Σ0.98(Zn0.82Cu0.13Mg0.07Fe3+ 0.01)Σ1.03(As0.98P0.02)Σ1.00O4. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 6.36(28)(111), 4.64(45)(220), 4.35(48)(002), 3.260(36)(411), 3.179(100)(222), 2.770(26)(113), 2.676(77)(600), 2.278(15)(602) and 1.710(15)(713, 115). Pharmazincite is hexagonal, a = 18.501(4), c = 8.7114(9) Å, V = 2582.4(8) Å3 and Z = 24 (single-crystal XRD data). Its space group is P63, by analogy with synthetic KZnAsO4 that has a crystal structure based upon a tetrahedral tridymite-type {ZnAsO4}-framework. It is isostructural with megakalsilite KAlSiO4. The new mineral is named for its chemical constituents.
Marco E. Ciriotti

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

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