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 35
lyingover each edge cut the second semiaxis belonging to thatedge, at the smaller distance w, and the third axis at thegreater distance m, then the hexakisoctahedron (7) is pro-duced, the parameters of which are m : n : 1, its sign mOw,and the most common varieties 30f, 402, and 50|-. 28 A…
Precious stones · Building stones · Mineralogy
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