(8) Special reactions. The alkaline mass when laid on silver gives a sulphur reaction. * * * * * SODA. * * * * * Mineral. Rock-salt Formula. NaCl. Behavior (1) in glass-bulb. Fuses to a clear liquid (2) in open tube. -- (3) on charcoal. Fuses, is absorbed by the charcoal and partially volatilized incrusting the charcoal around. (4) in forceps. Fuses with great ease and colors the flame yellow. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. Gives the chlorine reactions. * * * * * Mineral. Natron Formula. [.Na][..C] + 10[.H] Behavior (1) in glass-bulb. Fuses, with the evolution of water. (2) in open tube. -- (3) on charcoal. Fuses, and is absorbed into the pores of the charcoal. (4) in forceps. Fuses and behaves as the preceding. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. Dissolves in acid with violent effervescence. * * * * * Mineral. Soda-nitre Formula. [.Na][.....N]. Behavior (1) in glass-bulb. Fuses and if strongly heated evolves nitrous fumes. (2) in open tube. -- (3) on charcoal. Deflagrates and is absorbed into the charcoal. (4) in forceps. Deflagrates on platinum wire, coloring the flame yellow. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. In a glass-bulb with bisulphate of potassa, gives the NO^{5}-reaction. * * * * * Mineral. Glauber-salt Formula. [.Na][...S] + 10[.H]. Behavior (1) in glass-bulb. Fuses and gives off water having a neutral reaction. (2) in open tube. -- (3) on charcoal. Fuses, and is absorbed by the charcoal. The saturated charcoal laid upon silver gives the sulphur reaction (4) in forceps. Fuses and colors the flame yellow. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. Gives the SO^{3}-reaction. * * * * * Mineral. Glauberite Formula. [.Na][...S] + [.Ca][...S]. Behavior (1) in glass-bulb. Decrepitates with the evolution of more or less water, and when strongly heated fuses to a clear liquid.