Sanbornite is a rare barium phyllosilicate mineral with formula BaSi2O5.

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 1932[4] and named for mineralogist Frank B. Sanborn (1862–1936).

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