Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.313.16-3.23
1
7.18
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Fracture
-
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Indiscernible
[0001] indistinct, [1010] indistinct
Mohs Hardness
-99995
2
10
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Chemical Composition
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 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