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BROCHANTITE

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Originally appearing in Volume V04, Page 623 of the 1911 Encyclopedia Britannica.
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BROCHANTITE , a See also:

mineral See also:species consisting of a basic'See also:copper sulphate Cu4(OH)6SO4, crystallizing in the orthorhombic See also:system. The crystals are usually small and are prismatic or acicular in See also:habit; they have a perfect cleavage parallel to the See also:face lettered a in the adjoining figure. They are trans-See also:parent to translucent, with a vitreous lustre, and are of an See also:emerald-See also:green to blackish - green See also:colour. Specific gravity 3'907; hardness 32—4. The mineral was first found associated with See also:malachite and native copper in the copper mines of the Urals, and was named by A. See also:Levy in 1824 after A. J. M. Brochant de See also:Villiers. Several varieties, differing somewhat in crystalline See also:form, have been distinguished, some of them having originally been described as distinct species, but afterwards proved to be essentially identical with brochan- See also:tite; these are konigine from the Urals, brongniartine from See also:Mexico, krisuvigite from See also:Iceland, and warringtonite from See also:Cornwall. Of other localities, mention may be made of Rough-ten Gill, Caldbeck Fells, See also:Cumberland, where small brilliant crystals are associated with malachite and See also:chrysocolla in a quartzose See also:rock; Rezbanya in the Bihar Mountains, See also:Hungary; See also:Atacama in See also:Chile, with See also:atacamite, which closely resembles brochantite in See also:general See also:appearance; the Tintic See also:district in See also:Utah. A microscopical examination of the green copper ores of secondary origin in the See also:Clifton and Morenci district of See also:Arizona proves brochantite to be of extremely See also:common occurrence mostly intergrown with malachite which effectually masks its presence: it is not unlikely that the malachite of other localities will on examination be found to be intergrown with brochantite.

Mention may be here made of another orthorhombic basic copper sulphate not unlike brochantite in general characters, but differing from it in containing See also:

water of See also:crystallization and in its See also:fine See also:blue colour; this is the Cornish mineral langite, which has the See also:composition CuSO4.3Cu(OH) 2+ H20. (L. J.

End of Article: BROCHANTITE

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