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Bernardite, a new thallium arsenic sulphosalt from Allchar, Macedonia, with a determination of the crystal structure

Published online by Cambridge University Press:  05 July 2018

J. Pašava ,
F. Pertlik ,
E. F. Stumpfl  and
J. Zemann
J. Pašava
Affiliation:
Ustredni ústav geologický, CS-118 21 Praha, Czechoslovakia
F. Pertlik
Affiliation:
Institut fuer Mineralogie und Kristallographie, Universitaet Wien, A-1010 Wien, Austria
E. F. Stumpfl
Affiliation:
Institut fuer Mineralogie und Petrologie, Montanuniversitaet, A-8700 Leoben, Austria
J. Zemann
Affiliation:
Institut fuer Mineralogie und Kristallographie, Universitaet Wien, A-1010 Wien, Austria
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Abstract

The new mineral bernardite has been identified on one specimen from Allchar, Macedonia, Yugoslavia, together with orpiment and realgar. It forms black crystals, the size of which may exceed 1 mm. The streak is deep red; on an arbitrarily oriented section R(589nm) ranges from 23.8 to 24.7% in air, from 10.2 to 11.6% in oil. Microprobe analyses together with an X-ray structure analysis suggest the ideal formula TlAs5S8, with a possible replacement of As by Sb up to 15 wt. %. Monoclinic; a 15.647(4), b 8.038(3), c 10.750(3) Å, β 91.27(3)°; space group P21/c; Z = 4; R = 0.049, wR = 0.036 for 2410 reflections. The atomic arrangement consists of a 3-dimensional As5S8 framework with eight-coordinated T1 in its holes. The mineral is named for Doc. Dr Jan H. Bernard, Prague, Czechoslovakia.

Keywords

bernarditenew mineralthallium sulpharseniteAllcharMacedoniaTlAs5S8
Type
Non-silicate Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 373 , December 1989 , pp. 531 - 538
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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