Whatever the shade, it usually is quite attractive and a joy to possess in one's collection. Luster is vitreous. Crystals are transparent to translucent. Crystal System is Orthorhombic. Crystal Habits include microcrystalline crusts and small tabular crystals.
Cleavage is indistinct.
Fracture is uneven. Hardness is 3. Streak is white. Associated Minerals include wickenburgite , diopside , quartz , shattuckite , crocoite , ajoite , minium , cerussite , azurite , calcite , wulfenite and malachite . Best Field Indicators are crystal habit, color, density, non-colored streak and localities.