Color is typically a bright green, but also colorless, white or pale yellow. Luster is sub-adamantine or silky. Crystals are transparent to translucent. Crystal Habits include acicular or bladed crystals in druses, radial aggregates or crusts, also fibrous. Cleavage is perfect in one direction lengthwise.
Fracture is uneven.
Hardness is 4 - 4.5. Streak is white to pale green. Associated Minerals are adamite , legrandite , limonite , smithsonite , aragonite and other oxidation zone minerals. Best Field Indicators are crystal habit, cleavage, color, luster, density, lack of fluorescence and associations.