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Encyclopedia Britannica



AZURITE, or CHESSYLITE

This article appears in Volume V03, Page 86 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: AUD-BAI
AZURITE, or CHESSYLITE , a
mineral
  which is a basic copper carbonate, 2CuCO3 Cu(OH)2. In its vivid blue colour it contrasts strikingly with the
emerald
 -green malachite, also a basic copper carbonate, but containing rather more water and less carbon dioxide. It was known to Pliny
under the name caeruleum, and the modern name azurite (given by F. S. Beudant in 1824) also has reference to the
azure
 -blue colour; the name chessylite, also in common use, is of later date (1852), and is from the locality,
Chessy near Lyons, which has supplied the best crystallized specimens of the
mineral
 . Crystals of azurite belong to the monoclinic
system
 ; they have a vitreous lustre and are trans-lucent. The streak is blue, but lighter than the colour of the mineral in
mass
 . Hardness 314; sp. gr. 3.8.
Azurite occurs with malachite in the upper portions of deposits of copper ore, and owes its origin to the alteration of the sulphide or of native copper by water containing carbon dioxide and oxygen. It is thus a common mineral in all copper mines, and sometimes occurs in large masses, as in
Arizona
  and in
South
  Australia, where it has been worked as an ore of copper, of which
element
  it contains 55%. Being less hydrated than malachite it is itself liable to alteration into this mineral, and pseudomorphs of malachite after azurite are not uncommon. Occasionally the massive material is cut and polished for decorative purposes, though the application in this direction is far less extensive than that of malachite. (L. J. S.)


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