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. 19 Fig. 20 Fig. 21 arises Figs. 20 and 21, or a right and left deltoid dodecahedron, inwhich however, the previous triangular faces become Fig. 22 Fig. 23 Fig. 24 Similarly Figs. 22, 23, and 24, show the hemihedral forms, andtheir formation, of the Hexoctahedron.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912