4# Sphenoid (Dihedron)

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Number of faces: 2 A crystal form is a collective group of identical faces, all of which share the same relationship to the functions of symmetry on the crystal — the crystal's inherent symmetry has a direct impact on the specific forms that emerge. There are exactly forty-eight distinct crystal forms (forty-seven forms as defined by crystallographers at the Fedorov Institute) that can be developed from the 32 unique combinations of symmetry. Website: http://geology.uaic.ro/muzee/mineralogie/ Concept & 3D-modelling by dr. Andrei Ionut APOPEI