Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.20-3.302.74-3.00
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5-65-5.5
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe,Mn,Al) 2(SiO 4)(Si 2O 7)(OH) 2 · H 2OUlrich Henn and Claudio C.
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.