Tenacity
Brittle
-
Solubility
H₂SO₄
-
Durability
-
-
Specific Gravity
2.74-3.003.32-3.43
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Distinct on {0001} imperfect on {11 2 0}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
5-5.56-7
2
10
👆🏻
Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4