Tenacity
-
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.06-3.253.22-3.40
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal, Uneven
Conchoidal
Cleavage
Poor/indistinct on {100}
Perfect
Mohs Hardness
4.5-55-6
2
10
👆🏻
Chemical Composition
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)
(Ca,Mg,Mn)SiO 3Gemdat.org , Management Team (2012)