1 Physical Properties
2.1 Tenacity
2.3 Solubility
2.4 Durability
Not Available
Not Available
2.5 Specific Gravity
3.30-3.502.35-2.36
1
7.18
2.9 Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Conchoidal, Brittle
Not Available
2.10 Cleavage
Perfect on {110}, poor on {101}, {001} rare
{???} Indistinct
2.11 Mohs Hardness
2.12 Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 3B 6O 6(OH) 12 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)