Locality: The type locality is the Esquire #7 claim (Section 27, T11S, R25E, Mount Diablo Meridian, Lat. 36° 55′ N, Long. 119° 14′42″ W), along the west side of Big Creek, eastern Fresno County, California, U.S.A. Also found along the northwestern slope of Trumbull Peak, Mariposa County, California, U.S.A. (NE¼ Section 9, T3S, R19E, Mount Diablo Meridian).

Occurrence: In fractures in gneissic rocks composed of sanbornite, quartz, diopside, pyrrhotite and barium-bearing minerals. Other minerals from the type locality are: alforsite, walstromite, anandite, bazirite, benitoite, celsian, gillespite, fresnoite, macdonaldite, muirite, pellyite, titantaramellite and verplanckite.

General appearance: Subhedral crystalline...

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