Tenacity
-
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.06-3.253.03-3.18
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal, Uneven
Uneven, Irregular, Conchoidal
Cleavage
Poor/indistinct on {100}
{???} Indistinct
Mohs Hardness
4.5-57-7.5
2
10
👆🏻
Chemical Composition
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)