Prossima pubblicazione.
Referenza:
▪ Britvin, S.N., Murashko, M.N., Vapnik, Y., Zaitsev, A.N., Shilovskikh, V.V., Krzhizhanovskaya, M.G., Gorelova, L.A., Vereshchagin, O.S., Vasilev, E.A., Vlasenko, N.S. (2022): Orishchinite, a new terrestrial phosphide, the Ni-dominant analogue of allabogdanite. Mineralogy and Petrology, 116, (in press).
Abstract:
Orishchinite is a new terrestrial phosphide discovered in pyrometamorphic rocks of the Daba-Siwaqa combustion complex in West Jordan. The mineral occurs as an accessory phase in the fused clinopyroxene-plagioclase rock (paralava) texturally resembling gabbro-dolerite. Orishchinite forms resorbed equant grains up to 0.2 mm outrimmed with 0.1–0.2 thick zones of substituting murashkoite, FeP. Chemical composition (electron microprobe, wt%): Ni 38.49, Fe 22.38, Co 0.47, Mo 18.80, P 19.46, Total 99.60, corresponding to the empirical formula (Ni1.04Fe0.64Mo0.31Co0.01)Σ2.00P on the basis of 3 apfu. The simplified formula is (Ni,Fe,Mo)2P and the ideal one is Ni2P. Macroscopically, orishchinite grains have yellowish-white colour with metallic lustre. The mineral is brittle. In reflected light, orishchinite is yellowish-white and non-pleochroic. It is very weakly anisotropic (ΔR589 = 1.3%). Reflectance values for the wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are [Rmax/Rmin (%), λ (nm)]: 48.1/47.5, 470; 50.6/49.4, 546; 52.1/50.8, 589; 54.4/52.9.1, 650. The crystal structure was solved and refined to R1 = 0.016 based on 224 unique observed [I ≥ 2σ(I)] reflections. Orishchinite is orthorhombic, space group Pnma, a 5.8020(7), b 3.5933(4), c 6.7558(8) Å, V 140.85(3) Å3, Z = 4, Dx = 7.695 g cm-3. The strongest lines of the powder X-ray diffraction pattern [(d, Å) (I, %) (hkl)] are: 2.265(100)(112), 2.201(16)(202), 2.142(55)(211), 2.100(35)(103), 1.909(21)(013), 1.811(19)(113), 1.796(31)(020). Orishchinite is dimorphous with transjordanite (hexagonal Ni2P) and can be considered the Ni-dominant analogue of allabogdanite.
NdR: florenskyite group
Allabogdanite Fe2+2P orth Pnma 5.792 3.564 6.691 90.00 90.00 90.00 4 138.120
Andreyivanovite Fe2+CrP orth Pnma 5.833 3.569 6.658 90.00 90.00 90.00 4 138.606
Florenskyite Fe2+TiP orth Pnma 6.007 3.602 6.897 90.00 90.00 90.00 4 149.232
Grammatikopoulosite NiVP orth Pbnm 5.8893 3.5723 6.8146 90.00 90.00 90.00 4 143.368
Nickolayite Fe2+MoP orth Pnma 5.9519 3.7070 6.8465 90.00 90.00 90.00 4 151.059
Orishchinite Ni2P orth Pnma 5.8020 3.5933 6.7558 90.00 90.00 90.00 4 140.847
IMA 2019-039 = orishchinite
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
IMA 2019-039 = orishchinite
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- Marco E. Ciriotti
- Messaggi: 31675
- Iscritto il: ven 25 giu, 2004 11:31
- Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
- Contatta:
Re: IMA 2019-039 = orishchinite
Pubblicazione avvenuta.
Referenza:
▪ Britvin, S.N., Murashko, M.N., Vapnik, Y., Zaitsev, A.N., Shilovskikh, V.V., Krzhizhanovskaya, M.G., Gorelova, L.A., Vereshchagin, O.S., Vasilev, E.A., Vlasenko, N.S. (2022): Orishchinite, a new terrestrial phosphide, the Ni-dominant analogue of allabogdanite. Mineralogy and Petrology, 116, 369–378.
Referenza:
▪ Britvin, S.N., Murashko, M.N., Vapnik, Y., Zaitsev, A.N., Shilovskikh, V.V., Krzhizhanovskaya, M.G., Gorelova, L.A., Vereshchagin, O.S., Vasilev, E.A., Vlasenko, N.S. (2022): Orishchinite, a new terrestrial phosphide, the Ni-dominant analogue of allabogdanite. Mineralogy and Petrology, 116, 369–378.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
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