## crystallographic

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- This is one of the Platonic solids, and is treated in the article Polyhedron, as is also the derived Archimedean solid named the "truncated tetrahedron"; in addition, the regular tetrahedron has important
**crystallographic**relations, being the hemihedral form of the regular octahedron and consequently a form of the cubic system. - Mitscherlich, who also observed the similarity of the
**crystallographic**characters of selenates and sulphates, which afforded valuable corroboration of his doctrine of isomorphism. - The term allotropy has also been applied to inorganic compounds, identical in composition, but assuming different
**crystallographic**forms. Mercuric oxide, sulphide and iodide; arsenic trioxide; titanium dioxide and silicon dioxide may be cited as examples. - A crystal may be regarded as built up of primitive parallelepipeda, the edges of which are in the ratio of the
**crystallographic**axes, and the angles the axial angles of the crystals. - To reduce these figures to a common standard, so that the volumes shall contain equal numbers of molecules, the notion of molecular volumes is introduced, the arbitrary values of the
**crystallographic**axes (a, b, c) being replaced by the topic parameters' (x, ?i, w), which are such that, combined with the axial angles, they enclose volumes which contain equal numbers of molecules.

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