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Minjiangite, BaBe2(PO4)2, a new mineral from Nanping No. 31 pegmatite, Fujian Province, southeastern China

Published online by Cambridge University Press:  02 January 2018

C. Rao ,
F. Hatert ,
R. C. Wang ,
X. P. Gu ,
F. Dal Bo  and
C. W. Dong
C. Rao*
Affiliation:
Department of Earth Sciences, Zhejiang University, 310027 Hangzhou, P.R. China
F. Hatert
Affiliation:
Laboratoire de Minéralogie, B18, Université de Liège, B–4000 Liège, Belgium
R. C. Wang
Affiliation:
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, 210093 Nanjing, P.R. China
X. P. Gu
Affiliation:
School of Earth Sciences and Info-physics, Central South University, Changsha, 410083 Hunan, P.R. China
F. Dal Bo
Affiliation:
Laboratoire de Minéralogie, B18, Université de Liège, B–4000 Liège, Belgium
C. W. Dong
Affiliation:
Department of Earth Sciences, Zhejiang University, 310027 Hangzhou, P.R. China
*
*E-mail: [email protected]
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Abstract

Minjiangite, ideally BaBe2(PO4)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/cm3. Optically, minjiangite is uniaxial (+), with ω = 1.587(3), ε = 1.602(2) (λ = 589 nm). Electron-microprobe analyses (average of 8) give P2O5 40.16, BaO 43.01, BeO 14.06 (measured by Secondary Ion Mass Spectrometry), SiO2 0.17, CaO 0.17, SrO 0.08, FeO 0.03, MgO 0.01, TiO2 0.07, K2O 0.05, Na2O 0.11, total 97.92 wt.%. The empirical formula, calculated on the basis of 8 O a.p.f.u., is (Ba0.99Ca0.01Na0.01)Σ1.01Be1.98(P1.99Si0.01)Σ2.00O8. The powder X-ray diffraction (XRD) pattern of minjiangite perfectly fits that of synthetic BaBe2(PO4)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) Å3. These unit-cell parameters confirm that minjiangite is the natural analogue of synthetic BaBe2(PO4)2(P6/mmm, a = 5.029(1), c = 7.466 (1) Å, V = 163.52(1) Å3, 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.

Keywords

minjiangiteBaBe2(Po4)2new phosphate mineral speciesNanping No. 31 pegmatiteFujian provinceChina
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 5 , October 2015 , pp. 1195 - 1202
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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