Magnetite, ilmenite and chalcopyrite, Derbyshire, Britain
125µm
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
