Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.175.6-5.76
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
{001} Indistinct, {???} Indistinct
[001] perfect; [100] distinct
Mohs Hardness
5.52.5-3
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)