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Bonchevite, PbBi4S7, a new mineral

Published online by Cambridge University Press:  14 March 2018

Ivan Kostov
Ivan Kostov*
Affiliation:
University of Sofia
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Summary

In quartz-seheelite veins traversing rocks from the metamorphic complex in the Central Rhodopian mountains, a mineral was found closely resembling bismuthinite. Its composition is Bi 66·62 %, Pb15·50 %, Cu 0·85 %, and S 16·71 %, corresponding to the formula PbBi4S7. It is orthorhombic, long prismatic to acicular with an axial ratio a:b:c = 0·9004:1:0·3249. Observed forms: {110}, {100}, {010}, and {011}. Sp. gr. 6·92. Hardness about 2 1/2. Displays a perfect cleavage along {100}. It is distinctly anisotropic. Strongest X-ray intensities: 3·50 Å. (10), 3·08 (8), 1·939 (8), 2·78 (6), 1·733 (6), 2·50 (5). The name is after the eminent Bulgarian mineralogist and petrographer G. Bonchev.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 241 , June 1958 , pp. 821 - 828
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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