the Week of Proper 28 / Ordinary 33
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Bible Encyclopedias
Liroconite
1911 Encyclopedia Britannica
or a rare mineral consisting of hydrous basic copper and aluminium arsenate, with the probable formula Cu 9 A1 4 (OH) 15 (AsO 4) 5.20H 2 O. It crystallizes in the monoclinic system, forming flattened octahedra almost lenticular in shape (hence the German name Linsenkupfer). Characteristic is the bright sky-blue colour, though sometimes, possibly owing to differences in chemical composition, it is verdigris-green. The colour of the streak or powder is rather paler; hence the name liroconite, from the Gr. Xapos, pale, and Kovia, powder. The hardness is 22, and the specific gravity 2.95. The mineral was found at the beginning of the 19th century in the copper mines near Gwennap in Cornwall, where it was associated with other copper arsenates in the upper, oxidized portions of the lodes. (L. J. S.)
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Chisholm, Hugh, General Editor. Entry for 'Liroconite'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/l/liroconite.html. 1910.
