Annabergite is a mineral consisting of a hydrous nickel arsenate, Ni3(AsO4)2 + 8H2O, crystallizing in the monoclinic system and isomorphous with vivianite and erythrite. Crystals are minute and capillary and rarely met with, the mineral occurring usually as soft earthy masses and encrustations. A fine apple-green colour is its characteristic feature. It was long known (since 1758) under the name nickel ochre; the name annabergite was proposed by H. J. Brooke and W H. Miller in 1852, from Annaberg in Saxony, one of the localities of the mineral. It occurs with ores of nickel, of which it is a product of alteration. A variety, from Creetown in Kirkcudbrightshire, in which a portion of the nickel is replaced by calcium, has been called dudgeonite, after P. Dudgeon, who found it. 1758 was a common year starting on Sunday (see link for calendar). ... 1852 was a leap year starting on Thursday (see link for calendar). ...
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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.
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.
ANNABERGITE, a mineral consisting of a hydrous nickel arsenate, N13(As04)2+8H20, crystallizing in the monoclinic system and isomorphous with vivianite and erythrite.
Crystals are minute and capillary and rarely met with, the mineral occurring usually as soft earthy masses and encrustations.
It was long known (since 1758) under the name nickel-ochre; the name annabergite was proposed by H. Brooke and W. Miller in 1852, from Annaberg in Saxony, one of the localities of the mineral.
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