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Mineralogical ClassificationIMA 2014-055 = ferribushmakinite

1st Aug 2015 06:07 UTCMarco E. Ciriotti Manager

Reference:

▪ Kampf, A.R., Adams, P.M., Nash, B.P., Marty, J. (2015): Ferribushmakinite, Pb2Fe^3+(PO4)(VO4)(OH), the Fe^3+ analogue of bushmakinite from the Silver Coin mine, Valmy, Nevada. [i]Mineralogical Magazine[/i], [b]79[/b], 661-669.


Abstract:

Ferribushmakinite (IMA2014-055), Pb2Fe3+(PO4)(VO4)(OH), the Fe3+ analogue of bushmakinite, is a new mineral from the Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, USA, where it occurs as a low-temperature secondary mineral in association with plumbogummite, mottramite, Br-rich chlorargyrite and baryte on massive quartz. Ferribushmakinite forms yellow slightly flattened prisms up to 0.2 mm long growing in X and sixling twins. The streak is pale yellow. Crystals are translucent and have adamantine lustre. The Mohs hardness is ~2, the tenacity is brittle, the fracture is irregular to splintery and crystals exhibit one or two fair cleavages in the [010] zone. The calculated density is 6.154 g/cm3. Electron microprobe analyses provided: PbO 63.69, CaO 0.07, CuO 1.11, Fe2O3 7.63, Al2O3 1.63, V2O5 12.65, As2O5 3.09, P2O5 8.63, H2O 1.50 (structure), total 100.00 wt.% (normalized). The empirical formula (based on nine O a.p.f.u.) is: (Pb1.99Ca0.01)Σ2.00 (Fe0.66Al0.22Cu0.10)Σ0.98(V0.97P0.85As0.19)Σ2.01O7.84(OH)1.16. Ferribushmakinite is monoclinic, [i]P[/i]21/[i]m[/i], [i]a[/i] = 7.7719(10), [i]b[/i] = 5.9060(7), [i]c[/i] = 8.7929(12) Å, β = 111.604(8)°, [i]V[/i] = 375.24(9) Å3 and [i]Z[/i] = 2. The eight strongest lines in the powder X-ray diffraction pattern are [dobs in Å (I)(hkl)]: 4.794(46)(011); 3.245(84)(2İ11); 2.947(100)(020,2İ12,1İ03); 2.743(49)(112); 2.288(30)(220); 1.8532(27)(3İ14,4İ03); 1.8084(27)(multiple); and 1.7204(28)(312,114,321). Ferribushmakinite is a member of the brackebuschite supergroup. Its structure ([i]R[/i]1 = 3.83% for 577 Fo > 4σF) differs from that of bushmakinite only in the dominance of Fe3+ over Al in the octahedral site.

17th Aug 2015 18:38 UTCKnut Edvard Larsen 🌟 Manager

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