Wikipedia
Pseudowollastonite
Pseudowollastonite is a high-temperature mineral phase of CaSiO and is polymorphous with wollastonite. Its formula can alternatively be written as CaSiO. 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.