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
Fig. 36. Fig. 87. as the lateral axes fall in the angles, in the middle of thelateral edges, or in another point of these edges, the latterbeing hemihedral forms. They are also classed as acuteor obtuse, but without any very precise limits. The trigo-nal pyramid is bounded by six triangles, and may…
Precious stones · Building stones · Mineralogy
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