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. 129 Fig. 5 Fig. 131 28 A POPULAR GUIDE TO MINERALS two domes, two pyramids, three prisms; Fig. 129, Prism, two hemi-pyramids (rhomlDic sphenoids) ; Fig. 130, Prism, two hemi pyramids(the half faces in this last case have become equally developedmaking an orthorhombic pyramid.) (Epsom Salt and Sulphate ofZinc); Fig. 131, a hemimorphic crystal; viz, the opposite poles ofthe crystal show different faces. Hemihedrism shown in
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. 129 Fig. 5 Fig. 131 28 A POPULAR GUIDE TO MINERALS two domes, two pyramids, three prisms; Fig. 129, Prism, two hemi-pyramids (rhomlDic sphenoids) ; Fig. 130, Prism, two hemi pyramids(the half faces in this last case have become equally developedmaking an orthorhombic pyramid.) (Epsom Salt and Sulphate ofZinc); Fig. 131, a hemimorphic crystal; viz, the opposite poles ofthe crystal show different faces. Hemihedrism shown in the Isometric and Tetragonal systemsoccurs in the Orthorhombic. Sphenoids are produced by the sup-pression of alternate faces of the pyramid as in the tetragonalsystem, and the right and left tetrahedrons thus produced are shown
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
