Euclase

Euclase is a beryllium aluminium hydroxide silicate mineral (BeAlSiO4(OH)). It crystallizes in the monoclinic crystal system and is typically massive to fibrous as well as in slender prismatic crystals. It is related to beryl (Be3Al2Si6O18) and other beryllium minerals. It is a product of the decomposition of beryl in pegmatites. Euclase crystals ...
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Euclase

• (n.) A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina.
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Euclase

Eu'clase noun [ Greek ... well, easily + ... to break. Confer French euclase , German euklas . See named from its brittleness.] (Min.) A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina. ...
Found on http://www.encyclo.co.uk/webster/E/72

Euclase

Beryllium aluminum silicate
Found on http://www.translationdirectory.com/glossaries/glossary075.htm

Euclase

Euclase is a variety of beryl and has the formulae BeAlSiO4(OH) and a relative hardness of 8.
Found on http://www.probertencyclopaedia.com/browse/HE.HTM
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