Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.05-3.08
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Poor on {100}
Mohs Hardness
5.5-65
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)