Presenting hemihedral forms, in which half the sectants have the full number of planes.
The hemihedral form {hkl} of the hexakis-octahedron; it is bounded by twenty-four scalene triangles and is the general form of the class.
They crystallize in two complementary hemihedral forms, which are respectively right-handed and left-handed, i.
By some authors these two divisions are treated as separate systems; or again the rhombohedral forms may be considered as hemihedral developments of the hexagonal.
The remaining simple forms are "hemihedral with parallel faces," and from the corresponding holohedral forms two hemihedral forms, a positive and a negative, may be derived.
This is the hemihedral form of the hexakis-octahedron and has the indices {hkl}; it is bounded by twenty-four faces.
The general form {hkl} is a rhombohedron, and is a hemihedral form, with parallel faces, of the scalenohedron.
All the forms are pedions, each consisting of a single plane; they are thus hemihedral with respect to crystals of the last class.
These systems, however, only represented holohedral forms, leaving the hemihedral and tetartohedral classes to be explained.
This is the hemihedral form of the triakis-octahedron; it has the indices {hhk} and is bounded by twelve trapezoidal faces.
The general form {hikl} ishemihedral with parallel faces with respect to the general form of the holosymmetric class.
Corresponding to each of these hemihedral forms there is another geometrically similar form, differing, however, not only in orientation, but also in actual crystals in the characters of the faces.
Crystals belonging to many of the hemihedraland tetartohedral classes of the six systems of crystallization are devoid of a centre of symmetry.
The remaining simple forms have, however, only half the number of faces as the corresponding form in the last class, and are spoken of as "hemihedral with inclined faces.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "hemihedral" in a variety of sentences. We hope that you will now be able to make sentences using this word.
