Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.842.74-3.00
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
{0001} good, {10 1 0} parting
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
7.5-85-5.5
2
10
👆🏻
Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.