Chalcedony Samarskite Wad Brookite
Corundum Rutile Brookite Pyrolusite
Galena Silicon Dioxide Aluminium Oxide Iron Oxide
Opal Samarskite Wad Quartz
Spinel Rutile Uraninite Hematite
Corundum Chalcedony Hematite Spinel
Chromite Cuprite Magnetite Franklinite
Brookite Rutile Uraninite Spinel
Corundum Quartz Hematite Chalcedony