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Hydrohonessite—a new hydrated Ni-Fe hydroxy-sulphate mineral; its relationship to honessite, carrboydite, and minerals of the pyroaurite group

Published online by Cambridge University Press:  05 July 2018

Ernest H. Nickel  and
John E. Wildman
Ernest H. Nickel
Affiliation:
Division of Mineralogy, CSIRO, Wembley PO, Western Australia, Australia, 6014
John E. Wildman
Affiliation:
Division of Mineralogy, CSIRO, Wembley PO, Western Australia, Australia, 6014
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Abstract

Hydrohonessite has a composition that can be expressed by the formula [Ni8-x2+Fex+(OH)16] [x/2SO2-4.yH2O.zNiSO4], where x is approximately 2.6, y is 7, and z is 1. The X-ray powder diffraction pattern has strongest lines at 11.0 (10), 5.56 (5), 3.68 (4), and 2.709 Å (3), and can be indexed on a hexagonal unit cell with a = 3.09 Å and c = 10.80 Å. It is optically uniaxial negative with ɛ = 1.59 and ω = 1.63; bright yellow in hand specimen and transmitted light. Hydrohonessite is the hydrated equivalent of honessite, and is related to carrboydite, motukoreaite, and mountkeithite. These minerals are related to brucite and pyroaurite-type minerals in that they have a layered structure consisting of brucite-like layers separated by about 7 Å of interlayer material consisting predominantly of water, but also containing anions that balance the charge of the brucite-like layer. Hydrohonessite is a secondary mineral resulting from the weathering of Ni-Fe sulphides, and appears to be stable between pH 6 and 7.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 335 , September 1981 , pp. 333 - 337
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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