Probertite

Probertite 8.7×4.2×5.0 cm Cheverie Nova Scotia, Canada Copyright © David K. Joyce Minerals

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:

Probertite Locality: Kohnstedt Quarry, Niedersachswerfin, Nordhausen, Thuringia, Germany Overall Size: 27x10x8 mm Crystals: 3-12 mm © JohnBetts-FineMinerals
Probertite Locality: Borax Pit #3, Ryan, Inyo County, California Overall Size: 5x3x1 cm Crystals: 4-5 cm © JohnBetts-FineMinerals
Probertite Location: Niedersachswerfen, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale:     Crystal length 4.7 cm. Copyright: © Thomas Witzke / Abraxas-Verlag
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