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Bariosincosite, a new hydrated barium vanadium phosphate, from the Spring Creek Mine, South Australia

Published online by Cambridge University Press:  05 July 2018

A. Pring ,
U. Kolitsch ,
W. D. Birch ,
B. D. Beyer ,
P. Elliott ,
P. Ayyappan  and
A. Ramanan
A. Pring
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
U. Kolitsch
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
W. D. Birch
Affiliation:
Department of Mineralogy, Museum of Victoria, P.O. Box 666E, Melbourne, Victoria 3001, Australia
B. D. Beyer
Affiliation:
P.O. Box 33, Laura, South Australia 5480, Australia
P. Elliott
Affiliation:
Post Office, Carey Gully, South Australia 5144, Australia
P. Ayyappan
Affiliation:
Department of Chemistry, Indian Institute of Technology, New Delhi, 110 016 India
A. Ramanan
Affiliation:
Department of Chemistry, Indian Institute of Technology, New Delhi, 110 016 India
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Abstract

Bariosincosite is a new barium vanadium phosphate hydrate from the Spring Creek Mine, near Wilmington, South Australia. The new mineral occurs as irregular clusters of pale green, very thin platey crystals up to 250 µm across and 2 to 5 µm thick. The tetragonal crystals are tabular on {001} and the other form present is {100}. Associated with bariosincosite are quartz, cuprite, native copper, fluorapatite, whitlockite, baryte and springcreekite, BaV33+ (PO4)2(OH,H2O)6. Bariosincosite appears to have formed under supergene or low-temperature late-stage hydrothermal conditions. Electron microprobe analysis yielded: BaO 23.20; SrO 4.19; CaO 0.36; VO2 31.55; Fe2O3 0.20; Al2O3 0.50; P2O5 28.15; H2O 13.93 (calculated). These data give an empirical formula of (Ba0.77Sr0.20Ca0.03)∑1.00[(V0.964+ Al0.03Fe0.013+)∑1.00O(PO4)]2·4H2O, calculated on the basis of two P atoms. The simplified formula is Ba(V4+OPO4)2·4H2O. The mineral is transparent with a very pale green streak, a vitreous lustre and an estimated Mohs hardness of 3. The strongest lines in the X-ray powder pattern are [dobs (Iobs) (hkl)] 6.414 (20) (110, 002); 5.748 (70) (111); 4.552 (30) (112, 200); 3.198 (20) (220, 004); 3.100 (100) (203, 221); 2.847 (40) (222, 114); 2.786 (80) (311); 2.368 (30) (313, 115); and 2.017 (100) (420, 332, 116). These data were indexed on a tetragonal cell, with a = 9.031(6), c = 12.755(8) Å and V = 1040(1) Å3; the space group is probably P4/n or P4/nmm. For Z = 4 and using the empirical formula, the calculated density is 3.306 gm/cm3. Bariosincosite is uniaxial negative with ω = 1.721(2) and ε = 1.715(2) (white light); pleochroism is weak from colourless (E) to pale green (O), absorption O > E. The mineral is named for the relationship to sincosite, Ca(V4+OPO4)2·4H2O.

Keywords

bariosincositenew mineralbarium vanadium phosphatesincositeSpring Creek MineSouth Australia
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 5 , October 1999 , pp. 735 - 741
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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