Description
FIVE SPECIMENS: PERTHITE, MICROCLINE, OLIGOCLASE, ANORTHITE AND SODALITE Including a Perthite var. Feldspar: rather massive, Perth Area, Lanark Co., Ontario, Canada, measuring 10 x 8 x 5 cm ; Microcline, a large intergrown massive, Egonville, Ontario, Canada, measuring 10 x 8 x 3 cm ; Oligoclase, a rather massive, with...