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. 175 Fig. 176 and in adjacent pairs on opposite sides of the equatorial plane;Figs. 175-176. The trigonal prism results from the removal of alternate facesof the hexagonal prism; Figs. 177-178; the tritoprism from the DEFINITION OF TERMS 41. 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