How Do Geologists Classify Crystal Structures?

By Staff WriterLast Updated Mar 26, 2020 9:19:24 PM ET

Geologists classify crystals into six groups based on the number of axes and the angles of the facets, or faces, on a specimen. The science of crystallography labels the six categories as isometric, tetragonal, orthorhombic, monoclinic, triclinic and hexagonal.