Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.52.72-2.83
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Good on {100} and {110}
Mohs Hardness
5.5-66-7
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Na 2(Ti,Fe)Si 4(O,F) 11Ulrich Henn and Claudio C.