Tenacity
Brittle
Brittle
Solubility
H₂SO₄
-
Durability
-
-
Specific Gravity
2.74-3.005.85-6.15
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Distinct on {0001} imperfect on {11 2 0}
Fair in four directions forming octahedrons
Mohs Hardness
5-5.53.5-4
2
10
👆🏻
Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references