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 47
name to the system. As in the last system, its formsare either closed or open / and are divided into holohedral, Fis. 35. 40 A PKACTICAL TREATISE ON GEMS. hemihedral, and tetartohedral,^the last forms with only afourth i^art of their faces developed. The tetartohedral andmany of the hemihedral…
Precious stones · Building stones · Mineralogy
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