Tenacity
-
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.06-3.252.55-2.63
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal, Uneven
Uneven
Cleavage
Poor/indistinct on {100}
{001} Perfect, {010} Good
Mohs Hardness
4.5-56-6.5
2
10
👆🏻
Chemical Composition
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)
KAlSi 3O 8Arthur Thomas , Gemstones (2009)