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Probertite - Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz, Thuringia, Germany
(#:MINS9037)
Cluster of clear xls of Probertite in parallel growth , up to 5,5 cm long.
Formula :
NaCa[B
5
O_7_(OH)
4
] * 3 H
2
O
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.
Specimen weight:120 gr.
Crystal size:Up to 5,5 cm long
Overall size: 67mm x 40 mm x 38 mm
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