Wolframite and scheelite. Glen Gairn, Scotland
Coarse-grained wolframite (light grey) has been extensively replaced by scheelite (medium grey, centre). Much of the scheelite has a rhombic habit (centre bottom). Feldspar (grey, hard, bottom left) and phyllosilicates (lowest reflectance, poorly polished, top left) are the silicate gangue phases.
Polished thin section, plane polarized light, x 80, air