Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.40-2.425.6-5.76
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
{010} Perfect, {001} Distinct
[001] perfect; [100] distinct
Mohs Hardness
4.52.5-3
2
10
👆🏻
Chemical Composition
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)