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 59
Fig. 61. Fig. 62. the same minei^al, the hemipyramid P(o), and the clino-dome (2P00) {n)y are added. VI. Tricllnohedric System.—This is the least regular ofall the systems, and departs the most widely from symmetryof form. The axes are all unequal, and- inclined at anglesnone of which are right…
Precious stones · Building stones · Mineralogy
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