. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. THE NONMETALLIC MINERALS. 195 m. HALIDES. 1. Halite; Sodium Chloride; or Common Salt. Composition Na CI,^sodium per cent; chlorine per cent. The natural substance is nearly always more or less impure, as noted later. Hardness, ; specific gravity, to per cent. Colorless or white when pure, but often yellowish or red or purplish by the presence of metallic oxides and organic matter. Readily soluble in cold water, and has
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. THE NONMETALLIC MINERALS. 195 m. HALIDES. 1. Halite; Sodium Chloride; or Common Salt. Composition Na CI,^sodium per cent; chlorine per cent. The natural substance is nearly always more or less impure, as noted later. Hardness, ; specific gravity, to per cent. Colorless or white when pure, but often yellowish or red or purplish by the presence of metallic oxides and organic matter. Readily soluble in cold water, and has a saline taste. Crystallizes in the isometric system,. Fig. 2. CLUSTER OF HALITE CRYSTALS. Stassfurt, Germany. Specimen No. 40222, usually in cubes (fig. 2, Specimen No. 40222, ), but some- times in octahedrons, the faces of the crystals (particularl}'^ when pre- pared artificially) being often cavernous or hopper shaped. Sometimes occurs in fibrous forms, which it has been suggested are pseudomor- phous after fibrous gypsum (Specimen No. 64733, ). Often found in the form of massive, crystalline granular aggregates com- monly known as rock salt (Specimens Nos. 67558, 64736, 62946, ). Sylvite, the chloride of potassium, sometimes occurs associated with halite, where it has formed under similar conditions. From halite. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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