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Ni3(AsO4)2.8H2O
Monoclinic
Annabergite, a nickel arsenate hydrate mineral, was assumed by Koenig (1889) to be present in what was referred to as desaulesite (see pimelite) at Franklin. Palache (1935) considered it to be an unconfirmed species.
Annabergite was subsequently confirmed by the New Jersey Zinc Company (Edwards; The Picking Table, 19, #2, 10) from a find on the Trotter dump in 1971. It is not known from Sterling Hill.
Annabergite occurs as a whitish powdery encrustation on fluorite, associated with pimelite and nickel arsenides from the Trotter Shaft at Franklin. Because annabergite is not unambiguously differentiated from erythrite by X-ray methods alone, the identification is tentative. The Ni end-member is presumed because of the Ni-As dominance in the assemblage (see nickeline, rammelsbergite, etc.). However, the assemblage is Co-rich at its outer extremities where the probable annabergite powder occurs, and thus the unanalyzed material could possibly be nickeloan erythrite.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
page created: January 11, 2001 |
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