Definition of Oligaclase
Ol"i*go*clase (?), n. [Oligo- +
Gr. &?; fracture, fr. &?; to break.] (Min.) A triclinic
soda-lime feldspar. See Feldspar.
- Webster's Unabridged Dictionary (1913)
- A plagioclase feldspar, the second member of the Albite-Anorthite solid solution series. Primarily found as small crystals in impure marble. Oligoclase contains a small amount of calcium substituting for some of the sodium in its formula. Oligoclase with reddish-golden inclusions found in Norway and Canada is called sunstone.
- The Nuttall Encyclopedia
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