Sanbornite is a rare barium phyllosilicate mineral with formula bariumsilicon2oxygen5. Sanbornite is a colorless to white to pale green, platey orthorhombic mineral with Mohs hardness of 5 and a specific gravity of 3.74.
It was first described from Incline, Mariposa County, California in 1932Rogers, A.F. (1932) Sanbornite, a new barium silicate mineral from Mariposa County, California. Amer. Mineral., 17, 161–172 and named for mineralogist Frank B. Sanborn (1862–1936).
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