Witherite is a barium carbonate C Witherite crystallizes in the orthorhombic 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. light blue under both long- and short-wave UV light, and is phosphorescent
Witherite forms in low-temperature hydrothermal environments. It is commonly associated with fluorite , celestine, calcite. Witherite occurrences include: Cave-in-Rock, Illinois , US; Pigeon Roost Mine, Glenwood, Arkansas, US; Settlingstones Mine Northumberland; Alston Moor , Lancashire ; Thunder Bay , Germany and Tajno).
Witherite was named after William Withering (1741–1799) an English physician and naturalist who in 1784 published his research on the new mineral. He could show that barite and the new mineral were two different minerals.