Tenacity
Brittle
-
Solubility
H₂SO₄
-
Durability
-
-
Specific Gravity
2.74-3.002.90-3.10
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
Distinct on {0001} imperfect on {11 2 0}
Poor/indistinct on {1120} and {1011}
Mohs Hardness
5-5.57
2
10
👆🏻
Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references