(2) in open tube. Evolves thick white fumes of [...Sb],[.....Sb] and [.Pb][...Sb]. Also [.S]. (3) on charcoal. Fuses readily and incrusts the charcoal with [...Sb] and [.Pb] leaving a dark colored bead. (4) in forceps. -- (5) in borax. If the bead obtained on charcoal be fused on that support in the reducing flame with borax, a slight iron reaction is obtained, and after a time a copper reaction. (6) in mic. salt. As with borax. (7) with carb. soda. Yields a bead of metallic copper and lead and incrusts the charcoal with [...Sb] and [.Pb]. The alkaline mass laid on silver and moistened gives the sulphur reaction. (8) Special reactions. -- * * * * * Mineral. Red oxide of copper Formula. Cu^{2}O Behavior (1) in glass-bulb. -- (2) in open tube. Is converted into the black oxide CuO. (3) on charcoal. In the reducing flame is reduced, forming a bead of metallic copper. (4) in forceps. Fuses and colors the the flame emerald green, or if previously moistened with HCl, blue. (5) in borax. Gives the copper reaction. (6) in mic. salt. As with borax. (7) with carb. soda. Is reduced to a bead of metallic copper. (8) Special reactions. -- * * * * * Mineral. Atacamite Formula. CuCl + 3[.Cu] + 6[.H]. Behavior (1) in glass-bulb. Gives off much water, having an acid reaction, on test paper, and forms a light grey sublimate of CuCl. (2) in open tube. -- (3) on charcoal. Fuses, colors the flame blue, forms a brown and a pale grey incrustation on the charcoal, and is reduced to metallic copper, leaving a small quantity of slag. (4) in forceps. Fuses and colors the outer flame intensely blue and green towards the point. (5) in borax. Gives the copper reactions. (6) in mic. salt. As with borax. (7) with carb. soda. Is reduced, yielding a bead of metallic copper. (8) Special reactions. -- * * * * * Mineral. Dioptase Formula. [.Cu]^{3}[...Si]^{2} + 3[.H]. Behavior (1) in glass-bulb. Gives off water and turns black. (2) in open tube. -- (3) on charcoal. In the oxidizing flame becomes black. In the reducing flame red. (4) in forceps. V. Colors the outer flame intensely green.