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 41
placed by the faces 00O2of the octahedron, consequently with the sign . O. Figure 24 represents the same com-bination but with greater predomi-nance of the faces of the octahedron,the crystal being bounded by eightequilateral and twelve isosceles tri-angles. II. Tetragonal System.—This sys-tem has… … Fig. 24. FOEM OF MINERALS. 35 poles, and the edges connected with them polar edges. Thetwo other axes are named subordinate or lateral axes, anda plane passing through them is named the basis of thecrystal. The two planes that pass through the principaland one of the lateral axes are named normal…
Precious stones · Building stones · Mineralogy
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