Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.62-4.332.9-3.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Indiscernible
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
7-7.55.5-6
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)