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 241
e clinodiagonal, highlyj^erfect, very brittle and fragile; con-choidal fracture; hardness, 7*5; spe-cific gravity, 3*; transparent; splendidvitreous pale mountain-green, passinginto yellow, blue, or white. Whenheated before the blowpipe, it intu-mesces, and melts in thin splinters to awhite enamel;… … Fig. 7. J EMERALD. 235 Villa Rica, in Brazil; in Peru, and is said to have beenfound in Siberia. It is very rare, and for this reason notmuch used as a gem; it resembles much the aquamarinewhen cut. EMERALD. The emerald proper and the beryl belong to. this mineralspecies, and are distinguished by…
Precious stones · Building stones · Mineralogy
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