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Encyclopedia Britannica



EUCLASE

This article appears in Volume V09, Page 879 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: EMS-EUD
EUCLASE , a very rare
mineral
 , occasionally cut as a gem-stone for the cabinet. It bears some relation to beryl in that it is a silicate containing beryllium and
aluminium
 , but hydrogen is also present, and the analyses of euclase lead to the
formula
  HBeAlSiOs or Be(AlOH)SiO4. It crystallizes in the monoclinic system, the crystals being generally of prismatic habit, striated vertically, and terminated by acute pyramids. Cleavage is perfect, parallel to the clinopinacoid, and this suggested to R. J. Hauy the name euclase, from the Greek et), easily, and icXliais, fracture. The ready cleavage renders the stone fragile with a tendency to chip, and thus detracts from its use for personal
ornament
 . The colour is generally
pale
 -blue or green, though sometimes the
mineral
  is colourless. When cut it resembles
certain kinds of beryl (aquamarine) and
topaz
 , from which it may be distinguished by its specific gravity (3.1). Its hardness (7.5) is rather less than that of
topaz
 . Euclase occurs with topaz at Boa Vista, near Ouro Preto (Villa Rica) in the province of Minas Geraes, Brazil. It is found also with topaz and chrysoberyl in the gold-bearing gravels of the R. Sanarka in the
South
  Urals; and is met with as a rarity in the mica-schist of the Rauris in the Austrian Alps.


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