Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.22.74-2.76
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
Good in one direction
{010} Perfect, {001} Distinct
Mohs Hardness
6-6.53.5-4
2
10
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Chemical Composition
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)