Also cawke, (8 calk, 9 cauk, caulk). [A variant spelling of CAUK.]
1. ‘A miner’s term for native sulphate of barium’ (Watts, Dict. Chem.), or heavy spar.
1653. [see CAUK].
1676. J. Beaumont, in Phil. Trans., XI. 731. The Stones … move in Vinegar … sending forth bubbles, as I find Cawk will very freely.
1722. Phil. Trans. Abr., II. 553. Cawk is a ponderous white Stone found in the Lead Mines.
1783. Withering, in Phil. Trans., LXXIV. 307. Terra ponderosa Vitriolata, Calk or Cauk.
1806. Gazetteer Scotl., 398. In a matrix of sulphate of barytes or cawk.
1811. Pinkerton, Petral., II. 574. The … cauk-spar, since called barytes.
1813. Bakewell, Introd. Geol. (1815), 289. The matrix … is caulk or the sulphat of barytes.
1877. ‘Ouida,’ Puck, III. 25. I picked him out an atom of cawke and a morsel or two of Blue-John.
2. = CAUK, chalk.
