Terra: called also creta ful-lonica, terra and argilla Candida, creta cimolia. Tobacco Pipe Clay.
It takes the name cimolia from the island Cimolus, in the Cretan sea, now called Argentiere, where it is procured. It hath nearly the same absorbent quality with the boles, and is often substituted for them. Its soft viscous quality is its only medicinal one, and in this particular it excels most of the earths of its kind. It is the cimolite of modern authors, of a greyish white, inclining to red, by exposure to air. It sticks to the tongue, and though difficult to break, is scratched by the nail. It becomes white in the flame of a blow pipe, and does not melt but with the assistance of a flux. Haiiy, vol. iv. 446.
The cimolia alba of the ancients seems to have been a sort of loose marle; probably it was our fuller's earth. In Cornwall the steatites, a magnesian earth, is used as soap, as well as the cimolia alba of the ancients. It is usually marked with a seal, and called terra sigillata alba; the terra samia is only a fatter pipe clay.
Cimolia purpurescens terra. The smectis of Wallerius; terra saponaria Anglica, terra fullonica, and fuller's earth. It hath its name smectis from to absterge.
It is a kind of marle rather than a compact earth, and of the same qualities as bole. Indeed Wallerius has given this name to a true marle and to a steatite.