1 Physical Properties
1.1 Tenacity
1.2 Solubility
Easily soluble in cold dilute HCl
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Brittle, Uneven, Brittle, Uneven
Uneven, UnevenArthur Thomas, Gemstones (2009)
1.6 Cleavage
Good in two directions parallel to the prism faces {110}
perfect along [010] and [100]
1.7 Mohs Hardness
1.8 Chemical Composition
CaZn(AsO4)(OH)
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references