Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 195
vered by the celebrated German chemistMitscherlich, and the discovery is considered one ofthe greatest scientific achievements of our century. 1/4 PRECIOUS STONES. The group of minerals designated by the nameof garnets furnishes one of the most remarkableapplications of the grand theory of… … Fig. 80.—Garnet, Rhomboidal type. Fig. 81.—Garnet, Trapezohedral type. small number of secondary modifications. Garnetsare always crystallized, and they appertain to thetesseral system. Two secondary forms only arenearly always produced, the rhombic dodecahedron(Fig. 80), and the trapezohedron…
Precious stones · Diamonds · Gems
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