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NiAs2
Orthorhombic
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| Figure 21-35. Dendrites of rammelsbergite and gersdorffite are here shown in cross-section; nickeline is present as only small remnant cores. The black matrix is ferrostilpnomelane. Specimen is 9 cm in maximum dimension. Photo by Vic Krantz. | ||
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Pararammelsbergite, a nickel arsenide mineral, was first reported from Franklin
by Holmes (1945, 1947) and confirmed by the writer in Oen et al. (1984).
An analysis is given in Table 18. Pararammelsbergite is not known from Sterling
Hill. It occurs in the nickel arsenide assemblage described under nickeline
and rammelsbergite, but is a rare mineral.
Holmes (1945) reported pararammelsbergite to be one of the principal white arsenides in the nickeline assemblage, and Oen et al. (1984) reported it as spongy masses within the calcite gangue, obtained by dissolution of the calcite gangue in acid. Pararammelsbergite has been found as a component of the dendrites using XRD methods. A partial analysis is given in Table 18. The gangue minerals are sphalerite, calcite, fluorite, and barite.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
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