One of the mysteries of the English language finally explained.
A brittle reddish-brown crystalline mineral with an iridescent purple tarnish, consisting of a sulphide of copper and iron.
- ‘Other minerals suggested as coloring agents are malachite, tenorite, and bornite.’
- ‘Iron and copper sulfides of this region are predominately pyrite, pyrrhotite, chalcopyrite, arsenopyrite, bornite, and marcasite.’
- ‘Acanthite was relatively abundant in what was known as the Mount Lyell Bonanza at the Mount Lyell mine, Tasmania, where it occurred with chalcocite, bornite, and tetrahedrite in ores that ran as high as 1,011 ounces of silver per ton.’
- ‘Lovering, Tweto, and Lovering noted small veinlets of tetrahedrite cutting interbanded chalcopyrite and bornite.’
- ‘Fine specimens of silver associated with stromeyerite, bornite, and chalcopyrite have been recovered from the Silver King mine, Pinal County.’
- ‘Some of the best bornite specimens consist of plates of 5-mm blue-gray crystals upon which are perched large, complex chalcopyrite crystals.’
- ‘The Albert and Argent mines, South Africa, have produced arborescent masses of silver, some to several kilograms in weight and often in, or associated intimately with, bornite.’
- ‘When it rises through fractures in the surrounding solid rocks, these metals are precipitated, normally as the minerals chalcopyrite, bornite, and molybdenite.’
- ‘Some of the chalcopyrite is rimmed by bornite and more rarely by covellite and/or chalcocite.’
- ‘We have not seen any good crystals of bornite from Gilman.’
Early 19th century: from the name of Ignatius von Born (1742–91), Austrian mineralogist, + -ite.
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