Color is yellow, orange, reddish brown, brownish black. Luster is earthy to dull. Transparency is opaque. Crystal System is undefined. Crystal Habits include massive, layered, botryoidal and stalactitic.
Cleavage is absent.
Fracture is crumbly or earthy. Streak is brownish yellow to yellow. Associated Minerals include a large list of minerals particularly secondary deposit minerals. Best Field Indicators are lack of crystal forms, lack of cleavage and streak.