Sentence Examples with the word Hemihedral

The bisphenoids (the hemihedral forms of the tetragonal and rhombic bipyramids)., and the trigonal pyramid of the hexagonal system, are examples of non-regular tetrahedra (see Crystallography).

Iron pyrites, or pyrite, belongs crystallographically to the parallelfaced hemihedral class of the cubic system.

In this way a mixture of the two asparagines was obtained, which were separated by picking out the hemihedral crystals.

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A polyhedron is said to be the hemihedral form of another polyhedron when its faces correspond to the alternate faces of the latter or holohedral form; consequently a hemihedral form has half the number of faces of the holohedral form.