holohedral class

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• tristetrahedron — (|)tris, trəs+ noun Etymology: tris + tetrahedron : a solid (as a crystal) of the tetrahedral class of the isometric system having 12 triangular faces and related to the trapezohedron of the holohedral class compare deltohedron * * *… …   Useful english dictionary

• Cubic crystal system — A rock containing three crystals of pyrite (FeS2). The crystal structure of pyrite is simple cubic, and this is reflected in the cubic symmetry of its natural crystal facets …   Wikipedia