- Annabergite
Annabergite is a
mineral consisting of ahydrous nickel arsenate , Ni3(AsO4)2·8H2O, crystallizing in themonoclinic system and isomorphous withvivianite anderythrite . 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 (since1758 ) under the name nickel ochre; the name annabergite was proposed by H. J. Brooke and W H. Miller in1852 , from Annaberg inSaxony , 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.Closely related is "cabrerite" wherein some of the nickel is replaced by magnesium. It is named for Sierra Cabrera in Spain where it was originally found.
References
*1911
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