Tenacity
-
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
3.355-3.4333.32-3.43
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{???} Good, {???} Good
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
-99995.5-6
2
10
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Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references