Luster is vitreous. Specimens are translucent to transparent. Crystal System is triclinic. Crystal Habits include wedge-shaped to tabular or prismatic crystals and fibrous crusts. Cleavage is perfect.
Fracture is conchoidal.
Streak is white. Associated Minerals include strunzite , stewartite and limonite and others. Best Field Indicators are color, locality, crystal habit, associations and perfect cleavage.