Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Fig. 615. Fort Wrangell, 370 DESCRIPTIVE MINERALOGY. Crystallization.—Isometric. Usually a combination of thedodecahedron d and the tetragonal trisoctahedron, n = a:2a: 2a,Fig. 614, or these as simple forms, Figs. 611, 612, or more rarelywith the hexoctahedron, s = a : ^a : ^a. Index of refraction forred light to Physical Characters. H., to Sp. gr.,* to , vitreous or resinous. Transparent to opaque. Streak, white. Tenacity, brittle to tough. Color, bro
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Fig. 615. Fort Wrangell, 370 DESCRIPTIVE MINERALOGY. Crystallization.—Isometric. Usually a combination of thedodecahedron d and the tetragonal trisoctahedron, n = a:2a: 2a,Fig. 614, or these as simple forms, Figs. 611, 612, or more rarelywith the hexoctahedron, s = a : ^a : ^a. Index of refraction forred light to Physical Characters. H., to Sp. gr.,* to , vitreous or resinous. Transparent to opaque. Streak, white. Tenacity, brittle to tough. Color, brown, black, violet, yellow, red, white, , dodecahedral, imperfect. Before Blowpipe, Etc.—Fuses rather easily to light brownglass, except in case of infusible chromium and yttrium before fusion, but after fusion will usually gelatinize withhydrochloric acid. Bead reactions vary with composition. Varieties. Grossularite.~C&!,K\2{S^y White, pale yellow, pale-green,brown-red rose-red. Pyrope.—Mg3Alj(Si04),, Deep-red to nearly black, often trans-parent. Almandite.—Y^^I^4^^i. Fine
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