[ '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).
[ '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. 2004