Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.65-1.991.97-2.22
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{010} Perfect, {110} Perfect
None
Mohs Hardness
2-2.56-6.5
2
10
👆🏻
Chemical Composition
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001) More from other references