Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Fig. 386. Crystallization.—Isometric, class of diploid, p. 20. Most com-mon forms are cube a, Fig. 377, and pyritohedron e, Fig. 378, a:2a:<xa or combinations of these, Fig. 380. The octahedronalso occurs alone, Fig. 379, or in combination with a and e,Figs. 381, 382, 383, and the diploid j = «:|«: 3(2 is not rare in combinations, Figs. 384, 385. Twinning parallel to the dodecahedral face as described, p. 66, is frequent, Fig. 386. The faces of the cube and pyritohedron are frequently striated in
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Fig. 386. Crystallization.—Isometric, class of diploid, p. 20. Most com-mon forms are cube a, Fig. 377, and pyritohedron e, Fig. 378, a:2a:<xa or combinations of these, Fig. 380. The octahedronalso occurs alone, Fig. 379, or in combination with a and e,Figs. 381, 382, 383, and the diploid j = «:|«: 3(2 is not rare in combinations, Figs. 384, 385. Twinning parallel to the dodecahedral face as described, p. 66, is frequent, Fig. 386. The faces of the cube and pyritohedron are frequently striated in one direction parallel to in- Elba. tersections of these two forms. Physical Characters. H., 6 to Sp. gr., to , metallic. Opaque. Streak, greenish-black. Tenacity, brittle. Color, pale to full brass-yellow and brown from , imperfectly cubic.
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