A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)
Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 36
Fig. 10. Fig. 11. each face of the inscribed tetrahedron, and twelve interme-diate in pairs over its edges. The angles are six rhombic,joined in pairs by the principal axes, and four acuter andfour obtuser hexagonal angles.—Ex., diamond. The derivation and signs of these forms are as follows:—The…
Precious stones · Building stones · Mineralogy
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