<prompt> Cholesterol Stone made up ofAmorphous Cholesterol MonohydrateCrystalline Cholesterol MonohydrateCholesterol PolyhydrateCholesterol with Calcium Palmitate  <response>: Composition of Each Stones: - Cholesterol Stones: - Cholesterol Stones are formed by Nucleation of Cholesterol Monohydrate crystals from multilamellar vesicles. MC type of Gall stone in Western Countries Pigment Stones: - Contains 30 Cholesterol Brown Pigment Stone- Composed of Calcium Bilirubinate, Calcium Palmitate and Calcium Stearate as well as Cholesterol. Black Pigment Stone- Composed of Largely Insoluble Bilirubin pigment Polymer mixed with Calcium Phosphate and Calcium Bicarbonate. Ref:- Bailey and Love 27th Edition; Pg num:- 1198 