Tenacity
Brittle
Brittle
Solubility
H₂SO₄
insoluble
Durability
-
-
Specific Gravity
2.74-3.006.86-7.03
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Distinct on {0001} imperfect on {11 2 0}
{100} imperfect, {110} indistinct; partings on {111} or {011}
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.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references