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 57
byfour equal faces parallel to the principal axis, and the crosssection is a rhomb; the clinodomes have a similar formand section; while the horizontal prisms or domes haveunequal faces, and their section is a rhomboid. The mode of derivation of these forms closely resemblesthat of the rhombic… … FOEM OF MINEEALS. 51 and the angular inclination of the oblique axes (7, wliicli isalso that of the orthodiagonal section to the basis, are known. The fundamental series of forms is OP =tmP ±P d=mP ooP; from each of whose members, by changing the dimensions of the otheraxes, new forms may be again…
Precious stones · Building stones · Mineralogy
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