What is the Formula of Ultramarine Blue Pigment ?

Ultramarine Blue Pigment chemically is Sodium Alumino Sulphosilicate and represent a blue pigment comprising primarily of double silicate of aluminum & sodium with some sulphides / sulfates, Ultramarine pigment occurs in nature as a proximate component of lapis lazuli.

Molecular Formula Ultramarine Blue: Al6Na8O24S3Si6

Today, it is widely accepted in the global markets as the High heat stable Pigment blue 29 for Plastic applications.