perthite
Perth"ite, n. Etym: [So called from Perth, in canada.] (Min.) Defn: A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. -- Per*thit"ic, a.
Perth"ite, n. Etym: [So called from Perth, in canada.] (Min.) Defn: A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. -- Per*thit"ic, a.