Polishing characteristics and problems(b)

Adventitiously introduced metals and grinding grit, dried immersion oil and amalgam(b)

Extraterrestrial rocks and olivine nodule(c,d)

Ilmenite and magnetite in basalts and dolerites(a-f)

Altered iron-titanium oxides in alkali olivine basalt(c-f)

Unmineralized intermediate rocks(b-d)

Oxide placer deposits(a-c)

Magmatic iron-titanium ores(c-f)

Unmineralized sandstones(f)

Precious metal placer(e,f)

Adventitiously introduced metals and grinding grit, dried immersion oil and amalgam(a,c)

Extraterrestrial rocks and olivine nodule(a,d,e)