Haemoilmenite. Allard Lake, Quebec, Canada
Large crystals of an ilmenite host (brown) contain irregular exsolution discs of haematite (white) plus very fine-grained haematite exsolution bodies (bottom left). Multiple twinning is present (north-south orientation, lower reflectance, right), some of which can be confused with parallel scratches (northwest-southeast orientation, left) in plane polarized light. Black areas are polishing pits and fractures, many of the polishing pits are concentrated along twinning of the ilmenite.
Polished block, plane polarized light, x 80, air