Tenacity
-
Brittle
Solubility
Partly soluble in HCl.
H₂SO₄
Durability
-
-
Specific Gravity
3.32-3.432.74-3.00
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5.5-65-5.5
2
10
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Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.