- Kramer deposit
- Kern County
- 5.5 by 3.6 by 2.3 cm – Miniature specimen (fits into a 5 cm cube)
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.
Item code: MS0956
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