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Nukundamite, a new mineral, and idaite

Published online by Cambridge University Press:  05 July 2018

C. M. Rice ,
D. Atkin ,
J. F. W. Bowles  and
A. J. Criddle
C. M. Rice
Affiliation:
Department of Geology and Mineralogy, The University, Aberdeen AB9 1AS
D. Atkin
Affiliation:
Geochemical Division, Institute of Geological Sciences, 64/78 Gray's Inn Road, London WC1X 8NG
J. F. W. Bowles
Affiliation:
Geochemical Division, Institute of Geological Sciences, 64/78 Gray's Inn Road, London WC1X 8NG
A. J. Criddle
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road London SW7 5BD
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Summary

A new mineral, nukundamite, from a Fijian kuroko deposit is described. It has been referred to as idaite, Cu5FeS6, or Cu5.5xFexS6.5x. Electron-probe analyses gave Cu 56.51, Fe 9.64, and S 33.51, total with traces of Ag and As is 99.79%. Hexagonal with a 3.782, c 11.187 Å, Z = 1. Empirical formula Cu3.37, Fe0.66, S3.97 on the basis of eight atoms. Copper-coloured, metallic lustre, cleavage {0001} perfect. Density (g cm−3) 4.53 (calc), 4.30 (meas). Strongly pleochroic from reddish orange (Ro) to pale grey (Re). Parallel extinction. Very strong anisotropy with pale green-grey rotation colours. Reflectance values and quantitative colour values in air and oil are given. Similarities with the covelline structure are indicated.

An attempt to fully describe idaite from the Ida mine was unsuccessful. The description of the type material therefore remains inadequate.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 326 , June 1979 , pp. 193 - 200
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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