OLIGOCLASE


Meaning of OLIGOCLASE in English

[ 'ɒlɪgə(ʊ)kleɪz ]

■ noun a feldspar mineral common in siliceous igneous rocks, consisting of a sodium-rich plagioclase.

Origin

C19: from oligo- + Gk klasis 'breaking' (because thought to have a less perfect cleavage than albite).

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.