Tenacity
Brittle
-
Solubility
H₂SO₄
-
Durability
-
-
Specific Gravity
2.74-3.003.76-3.77
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
Distinct on {0001} imperfect on {11 2 0}
{110} Perfect, {110} Perfect
Mohs Hardness
5-5.55-6
2
10
👆🏻
Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.