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Webster 1913 Edition

Noun.

(Min.)

A variety of steatite sometimes manufactured into culinary vessels.

Noun.

Potstone appears to be indurated black talck, passing into serpentine. It has a curved and undulatingly lamellar structure, passing into slaty.

Potstone is of a greenish gray color. It occurs massive, or in granular concretions.

Potstone is a variety of steatite.

potstone ‎(countable and uncountable, plural potstones)

(mineralogy) A variety of steatite sometimes manufactured into culinary vessels.