The manufacturer claims (2023): "Amador air-floated clay’s plasticity makes it an ideal choice as an addition in the manufacturing of stucco and building compound products. The consistency of the product and reliability of the production process make this ideal for high-temperature applications."
Clay Other Clays that are not kaolins, ball clays or bentonites. For example, stoneware clays are mixtures of all of the above plus quartz, feldspar, mica and other minerals. There are also many clays that have high plasticity like bentonite but are much different mineralogically.