Magnetite, ilmenite and haematite. Clee Hills, Shropshire, Britain

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A large equant crystal of magnetite (pink-brown, left) is intergrown with, and encloses, plagioclase (dark grey, featureless). Oxidation-exsolution lamellae of ilmenite (pink-brown, lighter coloured than magnetite, top centre) are present. Magnetite has extensively altered to haematite (white-blue) and minor TiO2 phases (light grey) along fractures and crystal boundaries (centre bottom). Lobate ilmenite (right) is unaltered and is intergrown with plagioclase (dark grey and featureless). Pyroxene (grey, cop right) is present.

Polished block, plane polarized light, x 160, oil

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