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Ch. 6: The Diamond

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	100	PRECIOUS STONES

	of the crystal, too, varies considerably, though most commonly the octahedral forms predominate (Fig. 9); twin crystals are often seen, both of the contact and interpene-tration types. By suppression of alternate faces of the



	octahedron, forms of the regular tetrahedron arise. The plane of twinning is parallel to the octahedron, and the twins are often flattened parallel to the same form so as to have the general appearance of basal slices of two triangular pyramids applied to one another. The faces are

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