Chlorides - Anhydrous Chlorides, the Halite Group
The chlorides with the related bromides, iodiles and fluorides are grouped into the following division: (1) Anhydrous Chlorides, etc., (2) orxychlorides, etc., (3) Hydrous Chlorides, etc.
Anhydrous Chlorides, etc.
Halite Group
The Halite Group includes the isometric minerals halite, NaCl; syvite, KCl; cerargyrite, AgCl; embolite, Ag(Cl,Br); bromyrite, AgBr.
Halite. Common Salt
Composition. Sodium chloride, NaC1 = Chlorine 60,6, sodium 39.4. Commonly contains impurities, such as calcium sulphate and calcium and magnesium chlorides.
Crystallization. Isometric. Habit cubit cleavage. H. 2.5. G. = 2.1-2.6. transparent to translucent. Colorless or white, or when impure may have shades of yellow, red, blue, purple. Readily soluble in water. Salty taste. Diathermanous.
Test. easily fusible at 1.5, giving strong yellow flame of sodium. After intense ignition B.B. residue gives alkaline reaction to moistened test paper. Readily soluble in water; solution made acid with nitric acid gives with silver nitrate a he
Crystallization. Isometric. Habic cubi. Other forms very rare.
Structure. In crystals or granular crystalline, in masses showing cubical cleavage, know as rock salt. Also massive, granular to compact.
Physical Properties. Perfect cubic cleavage. . 2.5 G. = 2.1-2.6. Transparent to translucent. Colorless or white, or when impure may have shades of yellow, red, blue, purple. Readily soluble in water. Salty taste. Diathermanous.
Test. easily fusible at 1.5, giving strong yellow flame of sodium. After intense ignition B.B. residue gives alkaline reaction to moistened test paper. Readily soluble in water; solution made acid with nitric acid gives with silver niotrate a heavy white precipitate of silver chloride. Salty taste. Distinshed form sylvite (KC1) by its yellow flame color and by the latter having a somewhat more bitter taste.
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