Online Encyclopedia

ANNABERGITE

Online Encyclopedia
Originally appearing in Volume V02, Page 59 of the 1911 Encyclopedia Britannica.
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ANNABERGITE  , a

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mineral consisting of a hydrous nickel arsenate, Nia(AsO4)z+8HZO, crystallizing in the
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monoclinic
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system and isomorphous with
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vivianite and
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erythrite . Crystals are minute and capillary and rarely met with, the mineral occurring usually as soft earthy masses and encrustations . A
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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
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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
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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 .

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