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 45
yramids are produced by taking in each lateralaxis distances n greater than 1, and drawing two planes tothese points from each of the intermediate polar edges.The parameters of these planes are therefore m : 1 ; w, andthe general sign of the form mPn, the most common valueso1l n being |, 2, 3, and…
Precious stones · Building stones · Mineralogy
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