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(Ni,Mg)3Si4O10(OH)2
Monoclinic
Pimelite, a nickel silicate hydroxide mineral, was first described by Koenig (1889, 1890) from Franklin; it has not been reported from Sterling Hill. Koenig had named it desaulesite for Major de Saules, manager of the Trotter Mine; this material was shown to be identical with pimelite by Faust (1966). It is green, varying in hue and intensity with thickness and impurities, but is commonly a bright vivid green. The luster is not a useful discriminant. Chemical analyses were provided by Palache (1935). Pimelite occurs solely as localized, patchy, thin crusts and dense 1-6 cm masses as an alteration product of the nickel arsenides (Oen et al., 1984) from the Trotter Shaft at Franklin. It is a secondary, low-temperature mineral, associated with sparse annabergite and with fluorite, barite, and sphalerite.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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