Online Encyclopedia

ANNABERGITE

Online Encyclopedia
Originally appearing in Volume V02, Page 59 of the 1911 Encyclopedia Britannica.
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ANNABERGITE, a mineral consisting of a hydrous nickel arsenate, Nia(AsO4)z+8HZO, 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. (L. J. S.)
End of Article: ANNABERGITE
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