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. 177 Fig. 178 Fig. 179 Fig. 180 suppression of alternate pairs of faces in the dihexagonal prism;Figs. 179-180. The trigonal trapezohedron is a tetartohedral form, being the.

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912