Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{100} Perfect, {010} Distinct, {102} Distinct
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Conchoidal, Splintery, Fibrous
Perfect on {010}, distinct on {100}
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)