Chemical Formula: NaCaB5O7(OH)4·3H2O
Locality: Boron, Kern Co., California.
Name Origin: Named for Frank H. Probert (1876-1940), University of California, who discovered the mineral.
History
Authors: EAKLE
Discovery date : 1929
Town of Origin: MINE BAKER, KRAMER DIST., KERN CO., CALIFORNIE
Country of Origin: USA
Optical properties
Optical and misc. Properties: Fragile, cassant – Transparent –
Refractive Index : from 1,51 to 1,54
Axial angle 2V: 73°
Physical properties
Hardness : 3,50
Density : 2,14
Color : colorless
Luster: vitreous
Streak : white
Cleavage : yes
Photos:
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