Bournonite is a sulfosalt mineral in the titular bournonite group. It is a trithioantimoniate of antimony, lead, and copper. It can be found all over the world, most commonly in hydrothermal vein deposits and associated with sphalerite or siderite. The steel-gray crystals can form a repeated twinning habit known as cogwheel twinning: it has historically been called wheel-ore by Romanian miners near Baia Mare.
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