Also callen, kal, (?) gal. The name given by Cornish miners to the native tungstate of iron and manganese.
1875. Ure, Dict. Arts, III. 1039. The most common ore of this metal [Tungsten] is wolfram, known also to the Cornish miner as ‘cal’ or ‘callen’ Ibid. There remains a quantity of this mineral substance (gal).
1880. Miss Courtney, W. Cornwall Gloss., Cal.
