Ilmenite, sphene, pyrite, limonite and haematite. Glen Gairn, Scotland

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A diorite contains haemoilmenite that has coarse-grained haematite (white) exsolution discs in an ilmenite (brown, top centre) host. Sphene (light grey) rims the iron-titanium oxides. Pyrite (yellow-white, high reflectance, centre) has oxidized to limonite (blue-grey, higher reflectance than sphene, centre). Biotite (dark green-black) is intergrown with quartz (bottom left) that carries fluid inclusions (bottom left).

Polished thin section, plane polarized light, x 160, oil

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