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The new mineral insizwaite (PtBi2) and new data on niggliite (PtSn)

Published online by Cambridge University Press:  05 July 2018

L. J. Cabri  and
D. C. Harris
L. J. Cabri
Affiliation:
Mineral Sciences Division, Department of Energy, Mines and Resources, Mines Branch, 555 Booth Street, Ottawa, Canada. K1A 0G1
D. C. Harris
Affiliation:
Mineral Sciences Division, Department of Energy, Mines and Resources, Mines Branch, 555 Booth Street, Ottawa, Canada. K1A 0G1
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Summary

Insizwaite from Waterfall Gorge, Insizwa, is a new mineral with the composition Pt1·00Bi1·35Sb0·57. The name is for the locality and is to be applied to the end member PtBi2. The analysed material is an antimonian variety. The mineral is cubic, the unit-cell for the antimonian variety has a 6·625 (2) Å, probable space group Pa3, calc. D 12·8 g/cm3. The strongest lines on the X-ray diffraction powder pattern are: 2·96 (8) 210; 2·70 (8) 211; 2·34 (5) 220; 1·99 (10 311; 1·774 (7) 321; 1·433 (5) 421; 1·277 (6) 511, 333; 1·171 (6) 440; and 0·862 (7) 731. Under reflected light the mineral is white (in air and in oil) and is isotropic. Reflectance measurements at 470, 546, 589, and 650 nm gave 61·1, 60·0, 60·6, and 61·7 %. Micro-indentation hardness values range from 488 to 540 (av. 519) kg/mm2 with a 25 g load.

New data are presented for niggliite from the type locality and for synthetic PtSn.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 299 , September 1972 , pp. 794 - 800
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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