Magnetite and haematite. Skye, Scotland.

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Magnetite (pink-brown, right) is coarse-grained and is intergrown with haematite (white, centre), which encloses an euhedral basal section of quartz (dark grey, centre bottom). Silicates are dark grey (left), black areas are polishing pits.Coarse-grained magnetite is often difficult to polish well.

Polished block, plane polarized light, x 40, air

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