Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.28-3.442.9-3.5
1
7.18
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Fracture
Uneven, Splintery
Conchoidal
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5.0-6.05.5-6
2
10
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Chemical Composition
Na2Fe2+3Fe3+2Si8O22(OH)2
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)