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).
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