Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.773.04-3.17
1
7.18
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Fracture
-
Uneven
Cleavage
{110} Perfect, {110} Perfect
{001} Indistinct, {???} Indistinct
Mohs Hardness
5-65.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references