Haematite and magnetite. Skye, Scotland

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Haematite (white, right) is coarse-grained and shows very faint bireflectance along (101 1) twin planes, which are oriented north-south but difficult to see in plane polarized light. Magnetite (pink-brown, bottom left) is well polished. Dark grey areas are silicates, black areas are polishing pits.

Polished block, plane polarized light, x 80, air

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