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A sakhaite-like mineral from the Kombat Mine in Namibia
Pete J. Dunn, Donald R. Peacor, Joseph A. Nelen, Robert A. Ramik, John Innes
Journal:

Mineralogical Magazine / Volume 54 / Issue 374 / March 1990

Published online by Cambridge University Press:

05 July 2018, pp. 105-108
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Sakhaite from the Kombat Mine in Namibia is cubic, with a = 14.749(1)Å; the space group is a subgroup of Fd3m, the density is 2.88 g/cm3, and the index of refraction is n = 1.642(2). It is apparently more highly hydrated than previously described sakhaite, and has more aluminosilicate substitution. The idealized composition is Ca24Mg8(BO3)8[(BO3)y{AlSi4(O,OH)<16}x](CO3)8.< 8H2O with x = 0.73 and y = 5.0.

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A sakhaite-like mineral from the Kombat Mine in Namibia