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An introduction to minerals and rocks under the microscope

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Figure 25 Illustration of the seven crystal systems in relation to some everyday objects, and mineral examples. Note that only the diagnostic axes of symmetry have been shown - there are many others, as well as numerous mirror planes. The trigonal system is closely related to the hexagonal system, and is sometimes considered a subsystem of it. All the minerals mentioned in this chapter (except quartz) are given, along with a few others.

 1.6.3 Crystal systems