Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.76-3.772.90-2.98
1
7.18
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Fracture
-
Conchoidal
Cleavage
{110} Perfect, {110} Perfect
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
5-63.5
2
10
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Chemical Composition
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references