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EUCLASE , a very rare See also:mineral, occasionally cut as a See also:gem-See also:- STONE
- STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
- STONE, CHARLES POMEROY (1824-1887)
- STONE, EDWARD JAMES (1831-1897)
- STONE, FRANK (1800-1859)
- STONE, GEORGE (1708—1764)
- STONE, LUCY [BLACKWELL] (1818-1893)
- STONE, MARCUS (184o— )
- STONE, NICHOLAS (1586-1647)
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 See also:aluminium, but See also:hydrogen is also See also:present, and the analyses of euclase See also:lead to the See also:formula HBeAlSiOs or Be(AlOH)SiO4. It crystallizes in the See also:monoclinic 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 See also: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:personal See also:ornament. The See also:colour is generally See also:pale-See also:blue or See also:green, though sometimes the mineral is colourless. When cut it resembles
certain kinds of beryl (See also: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 See also:province of See also:Minas Geraes, See also:Brazil. It is found also with topaz and See also:chrysoberyl in the See also:gold-bearing gravels of the R. Sanarka in the See also:South Urals; and is met with as a rarity in the See also:mica-schist of the Rauris in the See also:Austrian See also:Alps.
End of Article: EUCLASE
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