Magnetite, covelline, malachite and haematite. Skye, Scotland
Anhedral magnetite (light brown-grey, bottom centre) is enclosed within garnet (medium grey, bottom right), the main phase. Covelline (blue, centre) shows cleavage and surrounds a small haematite crystal (white, centre). Malachite (dark grey, top left) shows faint green internal reflections. Dark grey areas are silicates, black areas are polishing pits.
Polished block, plane polarized light, x 80, air