Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.2-2.65.5
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
None
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
3-45-5.5
2
10
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Chemical Composition
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references