EUCLASE , a very rare
See also:mineral, occasionally cut as a
See also:stone for the
See also:cabinet . It bears some relation to
See also:beryl in that it is a silicate containing
See also:beryllium and aluminium, but hydrogen is also
See also:present, and the analyses of euclase lead to the
See also:formula HBeAlSiOs or Be(AlOH)SiO4 . It crystallizes in the
See also:system, the crystals being generally of prismatic
See also:habit, striated vertically, and terminated by acute pyramids . Cleavage is perfect, parallel to the clinopinacoid, and this suggested to R . J .
See also: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
See also:ornament . The
See also:colour is generally
See also:pale-blue or
See also:green, though sometimes the mineral is colourless . When cut it resembles certain kinds of beryl (aquamarine) and
See also: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
See also:Boa Vista, near Ouro Preto (
See also:Villa Rica) in the province of
See also:Minas Geraes, Brazil . It is found also with topaz and
See also:chrysoberyl in the gold-bearing gravels of the R .
Sanarka in theSouth Urals; and is met with as a rarity in the
See also:mica-schist of the Rauris in the
See also:Alps .
RUDOLF CHRISTOPH EUCKEN (1846– )
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