SAPONITE (Ca1/2Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2.2H2O Monoclinic

Description: Saponite is a clay mineral most often found as an amygdule filling in volcanic rocks.

DOUGLAS COUNTY: Saponite is reported as occurring in the amygdules of basaltic volcanic rocks exposed along the Black River. (Irving, 1883).

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