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 40
Fig. la Fig. IT. cube has its angles replaced by the faces of the octahedron,and the sign of this combination is ooOoo .0. In fig. 17this process may be regarded as having proceeded still fur- FORM OP MINERALS. 33 ther, so that the faces of the octahedron now predominate,and the sign, of the same…
Precious stones · Building stones · Mineralogy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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