Tags: Chemical Substance, Mineral.
Witherite is a barium carbonate mineral BaCO3 in the aragonite group. Witherite crystallizes in the orthorhombic system and virtually always is twinned. The mineral is colorless milky-white grey pale-yellow green to pale-brown. The specific gravity is 4.3 which is high for a translucent mineral. It fluoresces light blue under both long- and short-wave UV light and is phosphorescent under short-wave UV light.Witherite forms in low-temperature hydrothermal environments.
