Luster is adamantine or vitreous to greasy on fractured surfaces. Specimens are transparent to translucent. Crystal System is isometric. Crystal Habits include cubes and more rarely octahedrons, also granular and massive. Cleavage is indistinct.
Fracture is conchoidal.
Streak is white. Crystals are often diagonally striated and are sectile. Associated Minerals are barite , azurite , arthurite , olivenite , mixite , clinoclase , pharmacolite and limonite . Best Field Indicators are crystal habits, color, associations, lack of cleavage and softness.