Unit 2.2 of the course The Fascination of Crystals and Symmetry

In order to describe the outer shapes of crystals – the morphology – there are two central terms: set of faces (costume/dress) and habitus. The set of faces is the number and composition of different faces that build the outer limiting planes of the crystalline object. The habitus on the other side is related to the relative size of the different faces the crystal is
composed of. Two crystals can have the same costume/set of faces but a different habitus, and they can have the same habitus but different costumes.

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