talc

Granular quartz-rock of several varieties: and indistinct specimens of a rock approaching to talc-slate.

Add sufficient powdered talc to give the mass the necessary consistency.

It occurs in beds (talc-slate), and is often met with in districts occupied by metamorphic crystalline rocks.

The three last-mentioned minerals—talc, serpentine, and chlorite—are all silicates of magnesia.

Talc is a silvery white, grayish, pale or dark-green coloured mineral, with a pearly lustre.