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Encyclopedia Britannica



LIROCONITE

This article appears in Volume V16, Page 771 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: LEO-LOB
LIROCONITE , a rare
mineral
  consisting of hydrous basic copper and
aluminium
  arsenate, with the probable
formula
 
Cu9AI4(OH),5(AsO4)a30H2O. 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. Xeip6s,
pale
 , and Kovia, powder. The hardness is 2, 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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