soapstone

The English compound soapstone dates to the seventeenth century, a straightforward description: a stone that feels like soap. The mineral is actually talc (magnesium silicate), the softest mineral on the Mohs hardness scale, rating just 1 out of 10. Pick up a piece of soapstone and your fingers slide across it. It feels greasy, waxy, warm to the touch—unlike any other rock.

Soapstone carving is among the oldest art forms. Inuit carvers in the Arctic have worked soapstone for at least three thousand years, producing the animal and human figures that are now among the most recognizable indigenous art traditions in the world. In China, soapstone seals and carvings date to the Shang Dynasty, around 1500 BCE. In India, Hoysala temple architects used soapstone for the intricate exterior carvings of Belur and Halebidu in the twelfth century.

The same softness that makes soapstone easy to carve also makes it an excellent material for cooking vessels. Soapstone absorbs heat slowly and releases it gradually—the opposite of cast iron. Scandinavian hearths, Brazilian panelas (cooking pots), and West African cooking stones all exploit this thermal property. A soapstone pot on a fire heats evenly and stays warm for hours after the fire dies.

Soapstone's resistance to acids and heat made it essential in laboratory countertops and industrial acid tanks before modern synthetics replaced it. Chemistry labs at universities built in the nineteenth century still have soapstone bench tops, dark gray and smooth, carrying the scratches of a century of experiments. The soft stone, it turns out, resists everything except a blade.