(3) on charcoal. Fuses and detonates yielding Cr^{2}O^{3} and metallic lead, and forming an incrustation of PbO on the charcoal. (4) in forceps. As pyromorphite. (5) in borax. Dissolves readily and colors the glass yellow while warm, and green when cold. (See Chromium reaction.) (6) in mic. salt. As in borax. (7) with carb. soda. On platinum foil gives a dark yellow mass, which becomes paler on cooling. On charcoal yields a metallic button. (8) Special reactions. Treated as above with [.K],[...S]^{2} forms a violet colored mass, which on solidifying becomes reddish and on cooling pale grey. * * * * * Mineral. Molybdate of lead Formula. [.Pb][...M]. Behavior (1) in glass-bulb. As the preceding. (2) in open tube. -- (3) on charcoal. Fuses and is partly absorbed into the charcoal leaving a globule of metallic lead, which is partially oxidized and incrusts the charcoal. (4) in forceps. As pyromorphite. (5) in borax. Dissolves readily and gives the molybdena reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Yields metallic lead. (8) Special reactions. Fused as above with [.K],[...S]^{2} forms a yellow mass, which becomes white on cooling. If this be dissolved in water and a piece of zinc introduced into the solution, the latter becomes blue. * * * * * Mineral. Scheeletine Formula. [.Pb][...W]. Behavior (1) in glass-bulb. Decrepitates more or less. (2) in open tube. -- (3) on charcoal. Fuses to a bead incrusting the charcoal with PbO. The bead on cooling is crystalline and has a dark metallic surface. (4) in forceps. As pyromorphite. (5) in borax. Dissolves to a clear colorless glass, which in the reducing flame becomes yellow, and on cooling grey and opaque. (6) in mic. salt. Dissolves to a clear colorless glass, which in the reducing flame assumes a dusky blue color. After a time becomes opaque. (7) with carb. soda. As the preceding. (8) Special reactions. With carbonate of soda and nitre gives the manganese reaction. * * * * * COPPER. * * * * * Mineral. Native Copper