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LIROCONITE

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Originally appearing in Volume V16, Page 771 of the 1911 Encyclopedia Britannica.
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LIROCONITE , a rare See also:

mineral consisting of hydrous basic See also:copper and See also:aluminium arsenate, with the probable See also:formula Cu9AI4(OH),5(AsO4)a30H2O. It crystallizes in the See also:monoclinic See also:system, forming flattened octahedra almost lenticular in shape (hence the See also:German name Linsenkupfer). Characteristic is the See also:bright See also:sky-See also:blue See also:colour, though sometimes, possibly owing to See also:differences in chemical See also:composition, it is See also:verdigris-See also:green. The colour of the streak or See also:powder is rather paler; hence the name liroconite, from the Gr. Xeip6s, See also:pale, and Kovia, powder. The hardness is 2, and the specific gravity 2.95. The mineral was found at the beginning of the 19th See also:century in the copper mines near Gwennap in See also:Cornwall, where it was associated with other copper arsenates in the upper, oxidized portions of the lodes. (L. J.

End of Article: LIROCONITE

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