Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.7-3.9-9999
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{001} perfect; {111} imperfect, may exhibit parting on , {011}
None
Mohs Hardness
5.5-67-7.5
2
10
👆🏻
Chemical Composition
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.