Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Distinct on [010] and [100] poor on [101]
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
[010] Perfect, [100] Distinct, [011] Distinct
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite