Steatite, commonly known as soapstone, belongs to the talcschist mineral family. It is considered to be the cookware stone par excellence, due to its property of retaining and diffusing heat as well as its malleability that enables it to be shaped.
Various kinds of soapstone are found in nature, but just one of them can be considered proper for cooking purposes. This is a grey-coloured quality that, thanks to the peculiar balance of its chemical composition, endows soapstone cookware with those physical properties so appreciated by all professional chefs.
The best quality grey steatite, used by Cookstone in the manufacturing of soapstone cookware, is composed of:
- 40 –50% talc, making it easily workable and giving it a non-stick property.
- 40 – 50% magnesium carbonate in combination with a few other minerals (clorite, dolomite, actinolite, antofilite), making it resistant and compact in order to bear extremely high temperatures.
- other pure minerals (epidote, titanite, serpentinite, pirite, magnetite, limonite, ematite, ilmenite) to make up the remaining percentage.