Obs. A miner’s name for the mineral Black Tourmaline.
1761. Da Costa, Tourmalin, in Phil. Trans., LII. 446. The miners of Germany vulgarly call them Schirl, and sometimes our English miners name them Cockle and Call.
1788. Cronstedt’s Min., I. 148. A deep green cockle-spar. Ibid., I. 202. Schörls or cockles.
