Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.31
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Indiscernible
Mohs Hardness
5.5-6-9999
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
NaFe 3+ 3 Al 6 (BO 3 ) 3 Si 6 O 18 (O,F,OH) 4 Anthony et al, Handbook of mineralogy (2001)