5.2" Sphalerite "Flowers" and Druzy Marcasite - Missouri
This beautiful specimen contains deep red sphalerite "flower" crystal clusters that formed in association with iridescent druzy marcasite. It comes from the Washington County Aggregates Quarry in the Potosi Barite District of Missouri. Comes with an acrylic display stand for preferred presentation.
Sphalerite is a part of the sulfides group and typically exhibits a grey/black appearance due to high concentrations of impurities. When sphalerite is in it's purest state, the chemical composition is ZnS, and can display a gemmy transparent light tan/yellow color. This is one of the few minerals that can form crystals ranging anywhere between gemmy and transparent to opaque and metallic-like. Opaque or cloudy sphalerite tends to be most abundant, due to the ease of iron replacing zinc in the process of formation.