Nickel Minerals from Barberton, South Africa: Iv. Reevesite, A Member of the Hydrotalcite Group

S. A. De Waal; E. A. Viljoen

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Research Article| June 01, 1971

Nickel Minerals from Barberton, South Africa: Iv. Reevesite, A Member of the Hydrotalcite Group

S. A. De Waal;

S. A. De Waal

National Institute for Metallurgy, Johannesburg, South Africa.

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E. A. Viljoen

National Institute for Metallurgy, Johannesburg, South Africa.

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Author and Article Information

S. A. De Waal

National Institute for Metallurgy, Johannesburg, South Africa.

E. A. Viljoen

National Institute for Metallurgy, Johannesburg, South Africa.

Publisher: Mineralogical Society of America

Received: 19 Oct 1970

Accepted: 23 Nov 1970

First Online: 06 Jul 2018

Online ISSN: 1945-3027

Print ISSN: 0003-004X

Mineralogical Society of America

American Mineralogist (1971) 56 (5-6): 1077–1081.

Abstract

Reevesite, having the formula [Ni_16.69 Fe²⁺_0.83 Mg_0.41 Co_0.07] Fe³⁺_6.00 (OH)₄₈ (CO₃)₃·12H₂O, has been found in the nickel ore from the Bon Accord area in the Barberton Mountain Land, South Africa. The mineral occurs in druses as minute hexagonal platelets. It is moderate greenish yellow, has ω = 1.72, ϵ'(≃ϵ) = 1.63, and a measured specific gravity of 2.87. Forty-eight d-spacings obtained by X-ray diffraction have been indexed according to a hexagonal unit cell with a = 6.164 ± 0.003 Å and c = 45.54 ±0.02 Å. The infrared spectrum of the reevesite corresponds closely to that of sjogrenite, another member of the hydrotalcite group.