Wiktionary
teruggite
n. (context mineralogy English) A monoclinic-prismatic colorless mineral containing arsenic, boron, calcium, hydrogen, magnesium, and oxygen.
Wikipedia
Teruggite
Teruggite is a mineral with the chemical formula Ca Mg As B O(O H)ยท12 HO. 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.