Potstone
Webster's Revised Unabridged Dictionary
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Potstone
(Min) A variety of steatite sometimes manufactured into culinary vessels.
Century Dictionary and Cyclopedia
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(n)
potstone
A concretion or mass of flint, of a pear-shaped form, and having a central cavity passing through the longer axis. These concretions occur in the chalk, singly or in vertical rows like columns, at irregular distances from each other, but usually from 20 to 30 feet apart. They were formerly particularly conspicuous near Horstead, about six miles from Norwich, England, in a quarry, now closed, where they were mostly pear-shaped, and about 3 feet in height and 1 foot in diameter. Their origin is not easily explained. -
(n)
potstone
Same as soapstone or steatite.
Chambers's Twentieth Century Dictionary
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Potstone
a massive variety of talc-schist, composed of a finely felted aggregate of talc, mica, and chlorite
Etymology
Chambers's Twentieth Century Dictionary M. E. pot, from the Celt., as Ir. pota, Gael. poit, W. pot.
Usage in literature
Many of these contain small quantities of chromium and nickel, and are associated with soapstone, potstone, dolomite, and magnetite. "Asbestos" by