This Specimen has been sold.
4.4" Bladed Barite Crystals on Iridescent Chalcopyrite - Morocco
This is a cluster of bladed barite crystals that formed over iridescent chalcopyrite, collected from the Bou Nahas Mine in Morocco.
Barite, commonly spelled baryte, is well-known for its great range of colors and varied crystal forms and habits. It is a heavy mineral consisting of barium sulfate, and typically has the chemical formula of BaSO4. The barite group consists of baryte, celestine, anglesite and anhydrite. It's generally white to colorless and is the main source of barium.
Chalcopyrite is a brass-yellow colored mineral which is one of the most important ores of copper. When weathered chalcopyrite loses it's metallic luster, turning a gray-green color. When acids are present the tarnish can develop a red to blue to purple iridescence.