Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.16-3.23
1
7.18
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Fracture
-
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
{110} Perfect, {110} Perfect
[0001] indistinct, [1010] indistinct
Mohs Hardness
5-65
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references