Teruggite is a mineral with the chemical formula Ca<sub>4</sub>MgAs<sub>2</sub>B<sub>12</sub>O<sub>22</sub>(OH)<sub>12</sub>÷12H<sub>2</sub>O. It is colorless. Its crystals are monoclinic prismatic. It is transparent. It is not radioactive. It has vitreous luster. Teruggite is rated 2.5 on the Mohs Scale of hardness.