Home > California Borate Minerals – July 22 > MS0956 Probertite

Probertite - Sold

Probertite is a lower hydrate of ulexite, a sodium and calcium borate. Eakle (1929) named in the mineral in honor of Frank H. Probert (1876-1940), Dean of the Mining College, University of California (Berkeley). Probertite is unusual in the Kramer deposit, which is dominated by kernite, borax, and colemanite. This is a pale gray-green example, colored by a minor clay content. Not commonly available.