Tenacity
-
Sectile
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.355-3.4336.13
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{???} Good, {???} Good
Distinct on {001} and {110}, indistinct on {100}
Mohs Hardness
-99992-3
2
10
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Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references