Transparency crystals are transparent to translucent. Crystal Habits include stubby crystals that are usually well formed prisms topped with the three faces of a rhombohedon. Prisms are six sided and usually not very long. Simple rhombohedrons are also common, at times a second rhombohedron will modify the primary rhombohedron faces producing a second set of three smaller faces. Crusts and massive forms are also seen.
Cleavage is perfect in three directions forming rhombohedrons.
Fracture is conchoidal and brittle. Streak is green. Associated Minerals are dolomite , calcite , cerussite , limonite , chrysocolla and other copper minerals. Best Field Indicators are crystal habit, deep color and hardness.