> as lemmas

1580 J. Florio tr. J. Cartier Shorte Narr. Two Nauigations Newe Fraunce 55 The dagger hafte of one of oure fellowe Marriners, hangyng on hys side, being of yellowe Copper, guilte.

1681 N. Grew Musæum Regalis Societatis iii. §ii. i. 327 Yellow Copper-Ore, from the Mine at Herngrunt. Given by Dr. E. Brown.

1712 J. Browne tr. P. Pomet et al. Compl. Hist. Druggs II. ii. xi. 337/1 Besides the different Preparations that are made of this Yellow Copper [sc. brass], the Venetians..make of it that which the French call Purpurine, which heretofore was made use of upon Coaches.

1855 J. R. Leifchild Cornwall: Mines & Miners 219 The yellow copper ore, at present so valued,..was in fact cast aside as ‘mundic’.

1861 P. B. Du Chaillu Explor. Equatorial Afr. viii. 90 The ‘neptune’—a plate of yellow copper, which has long been one of the standard articles of trade imported hither by the merchants.

1901 L. Ransome Rep. Econ. Geol. Silverton Quadrangle, Colorado 80 Chalcopyrite (yellow copper).—Sulphide of copper and iron (Cu₂S.Fe₂S₃), corresponding to 34.5 per cent of copper.

1973 Jrnl. Afr. Hist. 14 180 African peoples themselves have generally made a clear distinction between ‘red’ copper, that is, copper in its pure form, and ‘yellow’ copper or brass.

2007 D. G. Ellingsen et al. in G. F. Nordberg et al. Handbk. Toxicol. Metals (ed. 3) xxvi. 530/1 Principal sulfidic [copper] ores are chalcocite (Cu₂S) and chalcopyrite (CuFeS₂, yellow copper ore).