Luster is vitreous to silky. Specimens are translucent to transparent. Crystal System is monoclinic. Crystal Habits include prismatic crystals and radiating clusters. Cleavage is not evident.
Fracture is conchoidal.
Streak is white. Associated Minerals include cassiterite , paravauxite , vauxite , wavellite , quartz and limonite . Notable Occurrences are limited to the famous tin deposits at Llallagua, Potosi, Bolivia and a few minor localities around the world. Best Field Indicators are color, locality, crystal habit and associations.