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Probertite

Type Locality
Baker mine, U.S. Borax Mine (Pacific West Coast Borax; Pacific Coast Borax Co.; Boron Mine; U.S. Borax and Chemical Corp.; Kramer Mine; Baker Mine), Kramer Borate deposit, Boron, Kramer District, Kern Co., California, USA
Mineral Data
NaCaB5O7(OH)4·3H2O
Strunz: 
6.EB.15
Physical Properties
Streak: 
White
Hardness: 
3.5
Tenacity: 
brittle
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