Color is usually a bluish-green to green. Luster is silky to vitreous to dull for massive specimens. Crystals are transparent to translucent. It typically is found as crusts and botryoidal masses or nodules. Cleavage is perfect in one direction but not usually noticed because of fibrous crystal habit.
Fracture is fibrous.
Streak is pale shades of bluish green or green. Associated Minerals include limonite , smithsonite , hemimorphite , malachite , aurichalcite and calcite . Best Field Indicators are crystal habits, color, associations, hardness and reaction to acid.