Wiktionary
sanbornite
n. (context mineralogy English) A rare orthorhombic barium phyllosilicate mineral.
Wikipedia
Sanbornite
Sanbornite is a rare barium phyllosilicate mineral with formula Ba Si O. 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 and named for mineralogist Frank B. Sanborn (1862–1936).