Although Calamine is not a clay, it's still a great powder used for masks, in soap and other cosmetic preparations.
Calamine is a mixture of Zinc (ZnO) with about 0.5% iron oxide (Fe2O3). It is the main ingredient in calamine lotion and is used as an antipruritic (anti-itching agent) to treat mild pruritic conditions such as sunburn, eczema, rashes, poison ivy, chicken pox, and insect bites and stings. It is also used as a mild antiseptic to prevent infections that can be caused by scratching the affected area, and an astringent to dry weeping or oozing blisters and acne abscesses
Here's a recipe for you to try at home. It clears the complexion, diminishes the blemishes from the skin and reduces oil.
1 spoonful of Calamine powder
1 spoonful of Nutmeg Powder
Few drops of lemon juice
Mix everything together into a paste and apply it on the skin. Wash it off when dries.