Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.1-3.2
1
7.18
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Fracture
Conchoidal
-
Cleavage
None
Vitreous, pearly on cleavage
Mohs Hardness
7-7.53-4
2
10
👆🏻
Chemical Composition
Al 4(Ta,Nb) 3(O,OH,F) 14Ulrich Henn and Claudio C.
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references