Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . o V Fig. 509. Northumberland. Fig. Crystallization.—Isometric. Usually cubes with modifyingforms, especially the tetrahexahedron c = a : 2a : ca a, the dodeca-hedron d and the hexoctahedron t ^ a: 2a: 4^. The cube facesare often striated parallel to the edges, giving the appearance of avery flat tetrahexahedron. Rarely found in octahedrons, some- \ Engineering and Mining Jorunal^ 190O) P- 2. CALCIUM AND MAGNESIUM MINERALS. 305 times formed by the grouping of small cubes in parallel
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . o V Fig. 509. Northumberland. Fig. Crystallization.—Isometric. Usually cubes with modifyingforms, especially the tetrahexahedron c = a : 2a : ca a, the dodeca-hedron d and the hexoctahedron t ^ a: 2a: 4^. The cube facesare often striated parallel to the edges, giving the appearance of avery flat tetrahexahedron. Rarely found in octahedrons, some- \ Engineering and Mining Jorunal^ 190O) P- 2. CALCIUM AND MAGNESIUM MINERALS. 305 times formed by the grouping of small cubes in parallel twins common, Fig. 240. Index of refraction for yellow light Physical Characters. H., 4. Sp. gr., to Lustre, vitreous. Transparent to nearly opaque. Streak, white. Tenacity, brittle. Color, wine-yellow, green, violet, blue, colorless, brown, , octahedral. Before Blowpipe, Etc.—In closed tube at a low heat becomesphosphorescent. In forceps fuses to a white opaque glass andcolors the flame red. Soluble in hydrochloric acid. Heated withacid potassium sulphate or sulphuric acid, fumes ar
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkdvannostran
