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Wollastonite was synthesized using calcium oxide from egg shells and silica from diatomite by being calcined at 800 o C. The calcium oxide and silica was synthesized in a molar ratio of 1 : 1 using the hydrothermal method at 100, 150, and 200 o C for 24 hours and then calcined at 1,000 o C for 24 hours. The morphology of wollastonite which was characterized by SEM indicated that the particles were an agglomerate consisting of small particles with sizes less than 1 μm. The FTIR spectra showed that the carbonate band at 1459 cm-1 was absent from calcination product and that was further confirmed by a thermogravimetric analysis. The ν(Si(OSi)3O-Ca wollastonite band presented as a band at 930 cm-1. The XRD results clarly show the structural formation of wollastonite. This method used to synthesize wollastonite is simple and able to function using cheap starting materials.
