It's possible to formulate a porcelaineous stoneware with just two materials
Left: 65% #6Tile kaolin and 35% Nepheline Syenite. It's white but crazes the glaze and has 1% fired porosity (measured in the SHAB test) so it does not have porcelain density. Plasticity is very good. Right: 65% M23 Old Hickory ball clay and 35% Nepheline Syenite. The glaze fits, it has zero porosity (very dense) and plasticity is fantastic! The body on the left needs 20% silica (to stop crazing) and 5% more Nepheline (to reduce porosity to porcelain levels), the remaining 40% kaolin will not be nearly enough for a workable plasticity (so bentonite will be needed). The body on the right does not need fixing, it works beautifully as is.
Stoneware To potters, stonewares are simply high temperature, non-white bodies fired to sufficient density to make functional ware that is strong and durable.