Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.65-1.996.50-7.00
1
7.18
👆🏻
Fracture
Uneven
Irregular, Conchoidal
Cleavage
{010} Perfect, {110} Perfect
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
2-2.53
2
10
👆🏻
Chemical Composition
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
PbMoO 4Walter Schumann , Gemstones of the world (2001)