The physical properties of wollastonite

pH

9,9

4,5 – 5,0 Moh's Scale

Specific gravity 

2,8 – 3,09 g/cm³

Melting Point

1540 °C

Sintering Temperature 

991 – 1196 °C

Moisture Content 

c.a. 1 %

Refractive Index 

1,616 – 1,631

Brightness 

90 – 93 GE

Solubility to Water 

0,0095 g/100 ml at 25 °C 

Coefficient of Thermal Expansion 

6,5 x 10 ^-6 mm/°C