Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.355-3.4332.9-3.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
{???} Good, {???} Good
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
-99995.5-6
2
10
👆🏻
Chemical Composition
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)