1. Wollastonite By Andrew Groth

2. Introduction Wollastonite – Two unique aspects Structure Uses

3. Structure Formula – CaSiO 3 – Two main components CaO wt% = 48.3% SiO 2 wt% = 51.7% – Very little deviation from the stoichiometric formula in nature

4. Structure cont. Double chain inosilicate – Pyroxenoid Group Different than pyroxenes – Pyroxenes’ chain motif repeats after every two SiO 4 tetrahedra – Pyroxenoids’ chain motif show longer repeat distance – Wollastonite repeats every three Triclinic

5. Uses Most Important – Ceramics – Principal Ingredient for ceramics used in wall and floor tiles – Adds strength – Fires white to grey – Fires at faster rate – Fires at lower temperature then other ceramic bodies Filler in paint and paper products Used in mineral wool insulation

6. Conclusion Wollastonite has two unique aspects – Structure CaSiO 3 Very little deviation Double chain inosilicate pyroxenoid Triclinc – Uses Ceramics Filler in paint and paper products mineral wool insulation