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Encyclopedic overview
A rock containing three crystals of pyrite (FeS2). The crystal structure of pyrite is primitive cubic, and this is reflected in the cubic symmetry of its natural crystal facets. A network model of a primitive cubic system The primitive and face-centered cubic (also known as cubic close-packed) unit cells In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.
There are three main varieties of these crystals:
Excerpted from Wikipedia’s “cubic crystal system” article, available under the CC BY-SA 4.0 licence.