Willemite is a rare mineral in finely crystallized specimens and there are only a few localities in the world that produce great display specimens. I think the two top localities for Willemite in the world are Franklin, New Jersey and of course, Tsumeb. The Willemite specimens from Tsumeb are highly prized for their wide range of colors and amazing beauty. This specimen features excellent, rare, sharp, lustrous, somewhat spherical, green-blue color, crystal aggregates of Willemite associated with minor Plancheite on matrix. It has beautiful luster and these specimens are among some of the most classic of species from Tsumeb. Ex. Richard Kosnar Collection.