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n. See plagioclase.

n. 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.

n. A triclinic soda-lime feldspar. See feldspar.

n. A soda-lime triclinic feldspar, the soda predominating. See feldspar.

n. any of a series of triclinic feldspars that form rocks

"It must be remembered, however, that it is only the orthoclase or potash felspars which contain large quantities of potash -- other felspathic rocks, such as oligoclase and labradorite, being comparatively poor in it."

feldspar    felspar   

plagioclase    rock    feldspar   

feldspar   

albite    white feldspar    anorthite