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 60
ned ; the latter named domes, andtheir section is always rhomboidal. In deriving the forms,the fundamental pyramid is placed upright with its brachy-diagonal axis to the spectator, and the partial forms desig-nated, the two upper by P and P, the two lower by ^Pand P^, as in the figure. The fiirther… … Fiff. 63.
Precious stones · Building stones · Mineralogy
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