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Iron gives it the reddish brown color when fired and causes the clay to melt more easily.
It may not work for stoneware, but most common clays are fine for earthenware. GOOD USES OF IMPURE CLAY - Potters who make high fire stoneware sometimes add small amounts of impure local clay to their clay body to add character and blemishes.
I regularly add some common brick clay to add character to my pottery.
Color and iron spots look more natural and give a warmer feeling.
Stoneware potters also use local clay as a source of glaze material.