Tenacity
Brittle
-
Solubility
H₂SO₄
Partly soluble in HCl.
Durability
-
-
Specific Gravity
2.74-3.003.32-3.43
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Distinct on {0001} imperfect on {11 2 0}
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
5-5.55.5-6
2
10
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Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references