Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.003.87-4.14
1
7.18
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Fracture
-
Subconchoidal, Conchoidal
Cleavage
{???} Indistinct
Poor on {120}, in traces on {001}
Mohs Hardness
5.55.5-6
2
10
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Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references