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- W2209247689 abstract "Abstract Minjiangite, ideally BaBe 2 (PO 4 ) 2 , is a new mineral species which has been found in the Nanping No. 31 pegmatite, Fujian Province, southeastern China. It occurs in the fractures of montebrasite from pegmatite zone IV, and is associated with quartz, muscovite, hydroxylapatite and palermoite. Minjiangite forms subhedral to euhedral white crystals from 5 to 200 μm long, transparent to translucent, with a vitreous lustre. The estimated Mohs hardness is ∼6, the tenacity is brittle and no cleavage was observed. The calculated density is 3.49 g/cm 3 . Optically, minjiangite is uniaxial (+), with ω = 1.587(3), ε = 1.602(2) (λ = 589 nm). Electron-microprobe analyses (average of 8) give P 2 O 5 40.16, BaO 43.01, BeO 14.06 (measured by Secondary Ion Mass Spectrometry), SiO 2 0.17, CaO 0.17, SrO 0.08, FeO 0.03, MgO 0.01, TiO 2 0.07, K 2 O 0.05, Na 2 O 0.11, total 97.92 wt.%. The empirical formula, calculated on the basis of 8 O a.p.f.u., is (Ba 0.99 Ca 0.01 Na 0.01 ) Σ1.01 Be 1.98 (P 1.99 Si 0.01 ) Σ2.00 O 8 . The powder X-ray diffraction (XRD) pattern of minjiangite perfectly fits that of synthetic BaBe 2 (PO 4 ) 2 ; the strongest eight lines of the powder XRD pattern of the natural phosphate [ d in Å ( I )( hkl )] are: 3.763(100)(101); 2.836(81.3)(102); 2.515(32.3)(110); 2.178(25.6)(200); 2.1620(19)(103); 2.090(63.9)(201); 1.770(16.2)(113); 1.507(25.4)(212). Unit-cell parameters, refined from the powder XRD pattern of natural minjiangite, are a = 5.030(8), c = 7.467 (2) Å, V = 163.96(3) Å 3 . These unit-cell parameters confirm that minjiangite is the natural analogue of synthetic BaBe 2 (PO 4 ) 2 ( P 6/ mmm , a = 5.029(1), c = 7.466 (1) Å, V = 163.52(1) Å 3 , Z = 1); its crystal structure is topologically similar to that of dmisteinbergite, CaAl2Si2O8, a hexagonal polymorph of anorthite. The formation of minjiangite is related to the hydrothermal alteration of montebrasite by late Ba- and Be-rich fluids." @default.
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- W2209247689 date "2015-10-01" @default.
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- W2209247689 title "Minjiangite, BaBe<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>, a new mineral from Nanping No. 31 pegmatite, Fujian Province, southeastern China" @default.
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- W2209247689 doi "https://doi.org/10.1180/minmag.2015.079.5.13" @default.
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