plagioclase
/ˈpleɪdʒɪəʊkleɪz/(亦作plagioclase feldspar)
noun
mass noun
- a form of feldspar consisting of aluminosilicates of sodium and/or calcium, common in igneous rocks and typically white斜长岩。
词源
mid 19th cent.: from plagio- 'oblique' + Greek klasis 'cleavage' (because originally characterized as having two cleavages at an oblique angle).