Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.85-3.94
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
{110} Perfect, {110} Perfect
{010} Good, {100} Distinct
Mohs Hardness
5-65-5.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)