Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.51.79
1
7.18
👆🏻
Fracture
Conchoidal
Irregular/uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Perfect on {10bar10}
Mohs Hardness
5.5-62.5
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)