Tenacity
Very brittle
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
3.30-3.405.6-5.76
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{010} perfect, {110} distinct, {100} in traces
[001] perfect; [100] distinct
Mohs Hardness
6.5-72.5-3
2
10
👆🏻
Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)