Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.22.62-2.67
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Vitreous, pearly on cleavage
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
3-46-6.5
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)