Image credit: Roger 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
staurolite
Image credit: James St. John
staurolite chemical formula: Fe2Al9Si4O22(OH)2
(interpreting mineral chemical formulas: atoms, molecules, elements)
mineral image credit: James St. John
Minerals.net
Webminerals
Mineralogical Society of America