Behavior in glass-bulb. Fuses readily to a clear brown oily fluid, which solidifies on cooling. on platinum foil. As the preceding. * * * * * Mineral. Amber Formula. C + H + O. Behavior in glass-bulb. Fuses with difficulty, and affords water, an empyreumatic oil, and succinic acid which condense in the neck of the bulb leaving a shining black residue. on platinum foil. Takes fire and burns with a yellow flame and a peculiar aromatic odor. * * * * * Mineral. Mellite Formula. [...Al][=M]^{3} + 15[.H] Behavior in glass-bulb. Gives off water. If heated to redness, is carbonized, and gives a slight empyreumatic odor. on platinum foil. On charcoal burns to a white ash, which moistened with nitrate of cobalt and heated shows the alumina reaction. * * * * * POTASH. * * * * * Mineral. Nitre Formula. [.K][.....N] Behavior (1) in glass-bulb. Fuses readily to a clear liquid and with a strong heat boils with the evolution of oxygen. (2) in open tube. -- (3) on charcoal. Deflagrates leaving a saline mass, which is absorbed into charcoal and gives a sulphur reaction on silver. (4) in forceps. On platinum wire fuses and colors the flame violet more or less modified by lime and soda. (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. -- (8) Special reactions. With bisulphate of potassa in the glass-bulb evolves nitrous fumes. * * * * * Mineral. Polyhalite Formula. [.K][...S]+[.Mg][...S]+2[.Ca][...S]+2[.H] Behavior (1) in glass-bulb. Gives off water. (2) in open tube. -- (3) on charcoal. Fuses to a reddish bead, which in the reducing flame solidifies and shrinks to a hollow crust. (4) in forceps. On platinum wire fuses and colors the flame yellow from a small quantity of soda. (5) in borax. Dissolves with ebullition to a clear glass, which is slightly colored by iron, and when saturated become opaque on cooling. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses. The alkalies are absorbed by the charcoal leaving the lime and magnesia infusible on the surface.