It is the other name of naturally found calcium carbonate and it is present in 98% pure form.
The remaining 2% contains traces of iron, aluminum and Silica
It is also called chalk
White or off white powder
Soluble in acid and insoluble in water
Paris white 99% is the purest powder
The commercial grade one is not pure white
Paper quoting, rubber making, filling agent in plastic making, white wash.