A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . Fig. 25 Fig. 26 Fig. 27 DEFINITION OF TERMS 13 Hemihedrism produces more complex results in the Tetrahexa-hedron, where (as shown in Fig. 25) the alternate faces (shadedand unshaded in figures) when developed, produce the pentagonaldodecahedron, Figs. 26, 27. Similarly alternate faces in the hexoctahedron quadrants (pre-viously taken away in alternate groups) shown, in shaded and un-shaded, in Fig. 28, produce the diplohedral forms of F
A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . Fig. 25 Fig. 26 Fig. 27 DEFINITION OF TERMS 13 Hemihedrism produces more complex results in the Tetrahexa-hedron, where (as shown in Fig. 25) the alternate faces (shadedand unshaded in figures) when developed, produce the pentagonaldodecahedron, Figs. 26, 27. Similarly alternate faces in the hexoctahedron quadrants (pre-viously taken away in alternate groups) shown, in shaded and un-shaded, in Fig. 28, produce the diplohedral forms of Figs. 29 and Fig. 29 Fig. 30 The hexoctahedron submits to a still different phase of hemi-hedrism—the plagihedral—which is illustrated in Figs. 31, 32, 33.(Compare and note differences with Figs. 28, 29, 30).
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
