Magnetite, ilmenite and chalcopyrite, Derbyshire, Britain

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Magnetite (brown) forms small euhedral (top centre) or subhedral crystals (centre) intergrown with slightly lighter coloured ilmenite (light brown, centre right). Ilmenite displays a symplectite-like intergrowth with the plagioclase matrix. A rounded intergrowth of fine-grained chalcopyrite (yellow, bottom centre) and ilmenite occurs about the margin of ilmenite, and has the shape of a sulphide droplet.

Polished block, plane polarized light, x 160, oil

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