plagioclase
Concise Oxford English Dictionary © 2008 Oxford University Press:
plagioclase /ˈpleɪdʒɪə(ʊ)kleɪz, ˈplagɪəʊ-/ (also plagioclase feldspar)
▶noun a form of feldspar consisting of aluminosilicates of sodium and/or calcium, common in igneous rocks and typically white.
– origin C19: from plagio- + Gk klasis ‘cleavage’ (because orig. characterized as having two cleavages at an oblique angle).
'plagioclase' also found in these Oxford entries:
amphibolite
- anorthosite
- basalt
- china stone
- diorite
- gabbro
- labradorite
- monzonite
- oligoclase
- plagio-
- tonalite

