Magnetite, ilmenite, TiO2 minerals and haematite. Guernsey, Channel Islands, Britain

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A diorite contains magnetite (light brown-grey, centre right) that has oxidation-exsolution lamellae of ilmenite (light pink-brown, centre) parallel to (111) of the magnetite. The lamellae have altered to a fine-grained intergrowth of TiO2 minerals and haematite (blue-white to light grey, centre left). Amphibole (bottom left) shows cleavage and biotite (top right) has light brown internal reflections.

Polished thin section, plane polarized light, x 80, air

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