Tenacity
-
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.06-3.253.05-3.08
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal, Uneven
Subconchoidal, Uneven, Conchoidal
Cleavage
Poor/indistinct on {100}
Poor on {100}
Mohs Hardness
4.5-55
2
10
👆🏻
Chemical Composition
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)