Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.23.82-4.00
1
7.18
👆🏻
Fracture
-
-
Cleavage
Vitreous, pearly on cleavage
{???} Indistinct
Mohs Hardness
3-45.5
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)