a rock containing three crystals of pyrite
). 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 cubic close-packed (also known as face-centered cubic) 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:
- primitive cubic (abbreviated cp and alternatively called simple cubic)
- body-centered cubic (abbreviated ci or bcc)
- face-centered cubic (abbreviated cf or fcc, and alternatively called cubic close-packed or ccp)
each is subdivided into other variants listed below. note that although the unit cell in these crystals is conventionally taken to be a cube, the primitive unit cell often is not.