1 Physical Properties
1.1 Tenacity
1.2 Solubility
Easily soluble in cold dilute HCl
insoluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Brittle, Uneven, Brittle, Uneven
Conchoidal, Brittle, Conchoidal
1.6 Cleavage
Good in two directions parallel to the prism faces {110}
{010} perfect, {110} distinct, {100} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
CaZn(AsO4)(OH)
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references