IMA 2016-019 = ozerovaite

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Marco E. Ciriotti
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IMA 2016-019 = ozerovaite

Messaggio da Marco E. Ciriotti » gio 27 set, 2018 14:02

Prossima pubblicazione.

Referenza:
▪ Shablinskii, A.P., Filatov, S.K., Vergasova, L.P., Avdontseva, E.Yu., Moskaleva, S.V., Povolotskiy, A.V. (2018): Ozerovaite, Na2KAl3(AsO4)4, new mineral species from Tolbachik volcano, Kamchatka peninsula, Russia. European Journal of Mineralogy, 30, (in press).
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: 24913
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2016-019 = ozerovaite

Messaggio da Marco E. Ciriotti » ven 09 nov, 2018 13:53

Prossima pubblicazione.

Referenza:
▪ Shablinskii, A.P., Filatov, S.K., Vergasova, L.P., Avdontseva, E.Yu., Moskaleva, S.V., Povolotskiy, A.V. (2018): Ozerovaite, Na2KAl3(AsO4)4, new mineral species from Tolbachik volcano, Kamchatka peninsula, Russia. European Journal of Mineralogy, 30, (in press).

Abstract:
The new mineral species ozerovaite was found in the fumarole of the second cinder cone of the Great Tolbachik Fissure Eruption. The colour of ozerovaite varies from colourless to pale yellow. It is insoluble in water. The mineral occurs as tabular crystals, 0.04 × 0.02 × 0.004 mm3 average size; with aggregates of 0.02–0.3 mm. The empirical formula calculated on the basis of 16 O apfu is (Na1.82K1.08)Σ2.90(Al2.62Fe0.32Cu0.12Zn0.02)Σ3.08(As3.95P0.07)Σ4.02O16, and the idealised formula is Na2KAl3(AsO4)4. Ozerovaite is orthorhombic: Cmca, a = 10.615(2), b = 20.937(3), c = 6.393(1) Å, V = 1420.9(3) Å3, Z = 4. The crystal structure (R1 = 0.031) is constructed of AlO6 octahedra and AsO4 tetrahedra, linked by the corners and edges. Adjacent layers are held together by six- and four-coordinated Na and six-coordinated K polyhedra. The eight strongest diagnostic lines of the X-ray powder diffraction pattern are (I, d in Å, hkl]: 44, 10.37, 020; 47, 5.47, 200; 47, 4.84, 220; 17, 3.76, 240; 26, 3.07, 061; 83, 2.922, 260; 100, 2.824, 202; and 71, 2.735, 400. Ozerovaite is biaxial, optically negative, α (calc.) = 1.645, β = 1.667(2), γ = 1.674(2) (589 nm), 2 V (meas.) = 58(10)°. Associated minerals are ponomarevite, piypite, dolerophanite, euchlorine, sylvite, lammerite, johillerite, urusovite, bradaczekite, filatovite, hatertite, hematite, tenorite and wrightite. The mineral is named in honour of the Russian scholar Dr. Nina Aleksandrovna Ozerova (1930–2012), for her contributions to geochemistry, geology, metallogeny, ecology and the eco-geochemistry of mercury.

NdR: il gruppo spaziale dovrebbe essere Cmce (non Cmca): https://www.iucr.org/news/newsletter/vo ... nal-tables
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