Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.765.50-5.90
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
{010} Perfect, {001} Distinct
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
3.5-44
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)