Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.82-4.00
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
-
Cleavage
Good on {110}, poor on {100}
{???} Indistinct
Mohs Hardness
7.55.5
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)