Emily Dickinson Lexicon

CAUK, or CAWK, n.

A name given by miners to certain specimens of the compact sulphate of baryta. These are of a white, gray or fawn color, often irregular in figure, but sometimes resembling a number of small convex lenses set in a ground. – Nicholson. Ure. This name is sometimes given to masses composed of concentric lamellar concretions. – Cleaveland.