Pseudowollastonite is a high-temperature polymorph of wollastonite. Its formula can be written as CaSiO₃ or as Ca₃Si₃O₉. Other names include wollastonite 7T, ß-Wollastonite, and cyclowollastonite. It occurs in high temperature (pyrometamorphic) environments such as the Hatrurim Formation of the Negev Desert and the graphite mine at Pfaffenrenth near Hauzenberg, Bavaria. It also occurs in slags and cement.