出典:Wikipedia
出典:『Wikipedia』 (2011/06/14 12:52 UTC 版)
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.