Willemite is one of the best examples of a fluorescent mineral and is a must have for any collector interested in this phenomenon. Color is usually colorless or white but can be tinted yellow, blue, red, brown and often green. Luster is vitreous to resinous. Transparency crystals are transparent to translucent. Also as granular, lamellar and fibrous masses.
Fracture is conchoidal to uneven.
Streak is white. Associated Minerals are zincite , franklinite , rhodonite , calcite , greenockite and other rare minerals. Best Field Indicators are fluorescence, associations, luster, cleavage and crystal habit.