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Crystal mineral
Answer for the clue "Crystal mineral ", 7 letters:
euclase
Word definitions for euclase in dictionaries
Wikipedia
Word definitions in Wikipedia
Euclase is a beryllium aluminium hydroxide silicate mineral (BeAlSiO(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 (BeAlSiO) and other beryllium ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Euclase \Eu"clase\n. [Gr. e'y^ well, easily + ? to break. Cf. F. euclase, G. 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 ...
Wiktionary
Word definitions in Wiktionary
n. (context mineral English) A monoclinic beryllium aluminium hydroxide silicate mineral, a product of the decomposition of beryl in pegmatites.
Usage examples of euclase.
Some other minerals in which it occurs are phenakite, euclase, and chrysoberyl.