Talc is a Hydrated Magnesium Silicate with the chemical formula Mg3 Si4 O10 (OH)2. It is a naturally occurring platy mineral. It can be white, grey, green, pale green & gray white in color.
Wollastonite is chemically a calcium meta silicate (casio3), it is a naturally occurring white & acicular mineral, it also improves tear strength, dielectric properties and retains mechanical properties at elevated temperatures.
Cenospheres are hollow, light grey, thin walled ceramic (alumino-silciate) microspheres which are very strong, non flammable, chemically inert and temperature resistant up-to more than 12000c
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