Smithsonite is a Zinc Carbonate and is part of the Calcite Group (AXO3). Smithsonite is a greatly diverse mineral like many species within the Calcite Group. It falls into the Trigonal system and forms commonly as Schalenohedral and Hexagonal crystals.
Smithsonite comes from a great variety of locales but none provide the quality and diversity quite like Tsumeb Mine in Namibia. Tsumeb has displayed some of the top world-class specimens of Smithsonite in pretty much any color and structure. Choix in Mexico and Kelly Mine in the United States are also very notable locales for fine Smithsonites, particularly in botryoidal habit.
What to look for: Color, Luster, Isolation and Formation of Crystals, Associations, Inclusions, Less or No Damage, and Specimens on Matrix.