Mineral   A naturally formed, inorganic solid with a specific chemical composition and characteristic crystal structure. Examples of minerals include quartz (SiO₂), salt (also called halite, NaCl), graphite (C). Rocks are formed of one or more minerals.

Used in the following modules: Charles Darwin I, Data: Statistics, Matter, Matter: States of Matter, Minerals I, Minerals II, Minerals III, Plate Tectonics I, Research Methods: Description, The Carbon Cycle, The Rock Cycle