Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.765.2
1
7.18
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Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Good in one direction
Mohs Hardness
3.5-46-6.5
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references