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Cobalt Arsenates

The ortho-arsenate, Co3(AsO4)2.8H2O, occurs in nature as erythrite or cobalt bloom in the form of monoclinic crystals isomorphous with vivianite, Fe3(PO4)2.8H2O, and perhaps with nickel ochre, Ni3(AsO4)2.8H2O. Its crystallographic elements are:

a:b:с = 0.7937:1:0.7356. В = 74° 51'

The pyro-arsenate Co2As2O7, is known, as also various ammonium arsenates.

An impure basic arsenate is known under the name of zaffre, and is used in painting porcelain. It may be obtained by roasting iron-free cobaltite, or by addition of sodium carbonate to a solution of cobaltite in nitric acid, when the zaffre is obtained as a precipitate.

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