Pyrite and TiO2 mineral, Lancashire, Britain

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An argillaceous limestone in which pyrite is poorly crystalline and porous (light yellow, centre), or well crystalline and euhedral (centre top) or replaces fossil fragments (left). Poorly crystalline TiO2 (blue-grey, centre) is probably anatase. Calcite (dark grey, well polished) and clay minerals (darker grey, poorly polished) are the main matrix phases. The sulphides and TiO2 mineral are associated with coarse-grained calcite, rather than the fine-grained matrix carbonate.

Polished block, plane polarized light, x 80, air

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