THENARDITE Na2SO4 (orthorhombic) . translucent gray crystal aggregate . Soda Lake, Carrizo Plain, San Luis Obispo County, California . 本礦呈板狀或雙角錐狀，硬度 2~3 ，比重 2.6，無色或灰白色． 形成於鹽湖的礦床中．與石膏，石鹽，Glauberite共生．
礦名來源：Named after the French chemist, L. J. Thenard (1777-1826).

經典名礦欣賞
NO.209