Tenacity
-
-
Solubility
Partly soluble in HCl.
-
Durability
-
-
Specific Gravity
3.32-3.432.74-2.76
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
{010} Perfect, {001} Distinct
Mohs Hardness
5.5-63.5-4
2
10
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Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)