Crystals are transparent to translucent. Crystal System is orthorhombic. Crystal Habits include tabular well formed crystals with curved faces and sharp angles. Also acicular crystals and earthy masses. Cleavage is perfect.
Fracture is conchoidal.
Hardness is 4. Streak is yellow. Associated Minerals are limonite , bismite and bismuth . Notable Occurrences are limited to Schneeburg, Saxony, Germany and Brejauba, Minas Gerais, Brazil. Best Field Indicators are color, crystal habit, density, luster and associations.