Color is white, colorless and purple. Luster is vitreous. Transparency crystals are transparent to translucent. Also acicular crystals in radiating groups. Cleavage is perfect in one direction.
Fracture is uneven.
Hardness is 4. Streak is white. Associated Minerals are limonite , cassiterite , adamite and vanadanite . Best Field Indicators are crystal habit, associations and locality.