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Tomichite, a new oxide mineral from Western Australia

Published online by Cambridge University Press:  05 July 2018

E. H. Nickel  and
I. E. Grey
E. H. Nickel
Affiliation:
Division of Mineralogy, CSIRO, Wembley WA, Australia 6014
I. E. Grey
Affiliation:
Division of Mineral Chemistry, CSIRO, PO Box 124, Port Melbourne, Vic., Australia 3207
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Summary

Tomichite, (V,Fe)4Ti3AsO13(OH), a new mineral species related to derbylite, has been found in the ‘green leader’ gold lodes at Kalgoorlie, Western Australia. It is monoclinic, with space group P21/m or P21; a = 7.119 (3), b = 14.176 (5), c = 4.992 (2) Å, β = 105.05 (I)°, Z = 2. Strongest diffraction lines: 3.092 (4), 2.836 (9), 2.663 (10), 1.572 (5). Tomichite occurs as tiny euhedral crystals in quartz; associated minerals are vanadian muscovite, rutile, pyrite, and calaverite. Tomichite is black, has a black streak, lacks internal reflections, is moderately anisotropic, and has S.G. = 4.16 (meas.), 4.42 (calc.). Reflectivity values are 470 nm-15.9%, 546 nm-16.3%, 589 nm 16.6%. Microhardness is VHN 800, using 50 g load.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 328 , December 1979 , pp. 469 - 471
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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References

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