plagioclase

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English[edit]

Etymology[edit]

From plagio- +‎ -clase, after German Plagioklas.

Pronunciation[edit]

Noun[edit]

plagioclase (usually uncountable, plural plagioclases)

  1. (mineralogy) Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.
    • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 51:
      These crystals are of one of the most abundant minerals in nature – feldspar; furthermore, they are of a particular kind of feldspar rich in the element calcium, termed plagioclase.

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