Image credit: R. Weller, Cochise College
Uncredited images and diagrams: Scott Brande
augite bauxite biotite calcite chalcopyrite
copper corundum K-feldspar fluorite galena
garnet graphite gypsum hematite halite
hornblende limonite magnetite muscovite olivine
plagioclase quartz microcrystalline quartz sulfur
staurolite sphalerite talc
Courtesy of Earth Sciences at the University of New Castle via license CC4.0-BY-NC
corundum
image credit: R. Weller, Cochise College
Al2O3
(interpreting mineral chemical formulas: atoms, molecules, elements)
Minerals.net
Webminerals
Mineralogical Society of America