Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.173.19-3.56
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{001} Indistinct, {???} Indistinct
{110} Perfect, {010} Indistinct
Mohs Hardness
5.55.5-6
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)