FIGURE 24.14 Some common minerals. (a) Pyrite (FeS₂), also called “fool’s gold.” (b) Graphite, a form of carbon (C). (c) Halite, or table salt (NaCl).

(a–b: John Grotzinger/Ramón Rivera-Moret/ Harvard Mineralogical Museum; c: The Natural History Museum/Alamy)