Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.65-4.552.74-3.00
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
None, but may exhibit slight parting
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
7.5-85-5.5
2
10
👆🏻
Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.