Cluster of clear xls of Probertite in parallel growth , up to 4,5 cm long.
Formula :
NaCa[B5O_7_(OH)4] * 3 H2O
System: monoclinic Hardness:3½ Rarity:rare
Strunz id:V/J.5-30 -
NITRATES, CARBONATES and BORATES
Name origin: After Frank H. Probert, Dean of the Mining College, University of California.
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 Specimen weight:20 gr.
 Crystal size:Up to 4,5 cm long
 Overall size: 45mm x 15 mm x 70 mm
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