Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.28-3.44
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Splintery
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
Mohs Hardness
5.5-65.0-6.0
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Na2Fe2+3Fe3+2Si8O22(OH)2