oligoclase definition

  • noun:
    • See plagioclase.
    • A plagioclase feldspar, the second person in the Albite-Anorthite solid option show. Mainly found as tiny crystals in impure marble. Oligoclase contains a tiny bit of calcium replacing for some of sodium in its formula. Oligoclase with reddish-golden inclusions within Norway and Canada is called sunstone.
    • A triclinic soda-lime feldspar. See feldspar.
    • A soda-lime triclinic feldspar, the soft drink predominating. See feldspar.
    • some of some triclinic feldspars that form rocks

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