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• W2140285440 abstract "Fluoro-potassichastingsite, ideally KCa2(Fe2+4Fe3+)Si6Al2O22F2, is found in compact aggregates of crystals up to 1 cm size on the waste-rock dump at the Greenwood mine, in Harriman State Park, Tuxedo, Orange County, New York, USA. It is associated with magnetite, diopside, enstatite, pyrrhotite, chalcopyrite, pyrite and, rarely, phlogopite. Fluoro-potassichastingsite is transparent, black to greenish in very thin fragments, and non-fluorescent in ultraviolet light; it has a vitreous luster and a greenish gray streak. The Mohs hardness is 6, Dmeas is 3.289 g/cm3, and Dcalc is 3.37 g/cm3. The {110} cleavage is perfect, and the fracture is conchoidal. It is biaxial negative, with α 1.668(2), β 1.688(2), γ 1.698(2), 2 V meas 40–70°, 2 V calc 70°, Y = b , Z ∧ c = 23°, and r < v . The observed pleochroism is X bluish green, Y green to brownish green, Z blue to light blue. The Gladstone– Dale compatibility index is superior, with 1 – ( K P/ K C) = 0.012 (based on empirical formula and calculated density). The mineral is monoclinic, space group C 2/ m , a 9.9480(3), b 18.1777(6), c 5.3302(2) A, β 105.140(1)°, V 930.41(8) A3, and Z = 2. The strongest eight X-ray powder-diffraction lines [ d in A( I )( hkl )] are: 8.499(100)(110), 3.151(76)(310), 2.830 (53)(330), 3.299(32) (240), 2.722(23)(151), 2.402(17)(350), 3.401(11)(131), and 1.661(10)(461). Combined electron-microprobe and Mossbauer data yield: SiO2 40.49, TiO2 0.11, Al2O3 10.29, V2O3 0.03, Cr2O3 0.01, Fe2O3 4.49, FeO 19.80, CaO 11.13, MgO 6.68, MnO 0.20, K2O 2.93, Na2O 1.24, F 2.23, Cl 0.61, H2O 0.70, O = (F+Cl) −1.08, sum 99.86 wt.%, which corresponds to the following crystal-chemical formula based on 24 [O + (OH) + F + Cl]: A (K0.59Na0.25)∑0.84 B (Ca1.87Na0.13)∑2.00 C (Fe2+2.60Mg1.56Fe3+0.53Al0.26 Mn0.03Ti0.01)∑4.99 T (Si6.36Al1.64)∑8.00 O22.68O3[F1.11(OH)0.73Cl0.16]∑2.00. The ICP–MS analyses on a crystal fragment different than the one analyzed for major elements yielded the following trace-element concentrations (ppm): Cu 278.9, Rb 162.5, Y 343.2, La 257, Ce 568, Nd 156. The new species and name have been approved by IMA–CNMMN (2005–006)." @default.
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• W2140285440 date "2009-08-01" @default.
• W2140285440 modified "2023-09-26" @default.
• W2140285440 title "FLUORO-POTASSICHASTINGSITE FROM THE GREENWOOD MINE, ORANGE COUNTY, NEW YORK: A NEW END-MEMBER CALCIC AMPHIBOLE" @default.
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• W2140285440 doi "https://doi.org/10.3749/canmin.47.3.909" @default.
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