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A new occurrence of vesigniéite from the Gorob-Hope copper deposit, Namibia

Published online by Cambridge University Press:  05 July 2018

G. I. C. Schneider  and
H.-J. Lauenstein
G. I. C. Schneider
Affiliation:
Geological Survey of Namibia P.O. Box 2168 Windhoek 9000, Namibia
H.-J. Lauenstein
Affiliation:
Tsumeb Corporation P.O. Box 40 Tsumeb 9000, Namibia
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Abstract

An iron-rich vesigniéite, [Ba(Cu,Fe)3(VO4)2(OH)2] with Cu : Fe near 4 : 1, was identified in samples from the submarine-exhalative Gorob-Hope copper deposit, Namibia. The olive-colour mineral occurs as mammillary encrustations and vein fillings in the gossan zone of this deposit; it often has a brownish oxidation coating. The main X-ray lines are 3.21 Å (100) [204, 113], 2.72 Å (63) [313,002] and 2.94 Å (61) [020, 311]. The cell parameters are a = 10.236, b = 5.905, c = 14.253 Å and B = 103.71°. The formation of vesigniéite took place during the alteration of the ore under strongly alkaline and slightly reducing to oxidizing conditions. While copper and barium were derived from the submarine exhalative mineralisation, vanadium was leached from the countryrock, a micea schist.

Keywords

vesigniéitevanadateGorob-Hope depositNamibia
Type
Research Article
Information
Mineralogical Magazine , Volume 56 , Issue 382 , March 1992 , pp. 67 - 69
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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