Hexagonal bifrustum

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Hexagonal Bifrustum
Tetragonal trapezohedron
Type Bifrustum
Faces 12 trapezoids, 2 hexagons
Edges 24
Vertices 18
Symmetry group D6h
Dual polyhedron elongated hexagonal dipyramid
Properties convex

The hexagonal bifrustum or truncated bipyramid is the fourth in an infinite series of bifrustum polyhedra. It has 12 trapezoid and 2 hexagonal faces.

This polyhedron can be constructed by taking a hexagonal dipyramid and truncating the polar axis vertices, making it into two end-to-end frustums.

A sapphire or ruby crystal is an example of a hexagonal bifrustum.

It has been used for a decorative polyhedral monthly calendar, with one month on each trapezoid face. (regular and rhombic dodecahedra have also been used for calendar months.)

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