Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.355-3.4333.16-3.23
1
7.18
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Fracture
Uneven
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
{???} Good, {???} Good
[0001] indistinct, [1010] indistinct
Mohs Hardness
-99995
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references