Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.71-2.723.1-3.2
1
7.18
👆🏻
Fracture
Fibrous
-
Cleavage
{???} Good
Vitreous, pearly on cleavage
Mohs Hardness
6-6.53-4
2
10
👆🏻
Chemical Composition
Ca 6Si 6O 17(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references