Tenacity
Brittle
Brittle
Solubility
Soluble
H₂SO₄
Durability
-
-
Specific Gravity
2.752.74-3.00
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven
Cleavage
Imperfect on {110}
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5.55-5.5
2
10
👆🏻
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.