Chromite, ulvöspinel and iron-nickel alloy. Apollo 12, Lunar Sample 1200
Subhedral chromite (green-grey, centre) cores are enclosed within ulvöspinel rims (brown-yellow, centre left). Iron-nickel alloy (white, high reflectance, bottom control forms rounded inclusions in the spinel phases. Pyroxene (light grey) shows strong internal reflections (right). Plagioclase (dark grey, left) shows weakly developed internal reflections.
Polished thin section, plane polarized light, x 400, oil