Tenacity
-
Elastic
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.22.78-2.88
1
7.18
👆🏻
Fracture
-
-
Cleavage
Vitreous, pearly on cleavage
Perfect on the {001}
Mohs Hardness
3-42-3
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references