Kaolin is a layered silicate minera lwith the chemical composition Al2Si2O5(OH)4. Kaolin is used in ceramics, medicine, coated paper, as a food additive, in toothpaste, as a light diffusing material in white incandescent light bulbs, and in cosmetics.
Passes test (Fuse 1gm with 2 gm of anhydrous sodium carbonate, warm the residue with 10 ml of water, filter, wash the filter with 5 ml of water and reserve the residue. To the combined filtrate and washings add 3 ml of hydrochloric acid; a gelatinous precipitate is produced)