(2) in open tube. Evolves SO^{2} and a white sublimate of arsenious acid. (3) on charcoal. Gives off arsenical fumes. (4) in forceps. III. Colors the flame blue beyond the assay, owing to the presence of Pb. Sometimes also green towards the point, due to Cu. (5) in borax. The roasted mineral affords the uranium reaction. (6) in mic. salt. As borax. Also a small residue of silica. (7) with carb. soda. Infusible. Affords the characteristic Pb incrustation, and sometimes yields minute particles of Cu. (8) Special reactions. -- * * * * * Mineral. Uranium ochre Formula. [...U=][.H]^{2}. Behavior (1) in glass-bulb. Evolves water and assumes a red color. (2) in open tube. -- (3) on charcoal. V. In reducing flame assumes a green color. (4) in forceps. -- (5) in borax. Gives the uranium reaction. (6) in mic. salt. As in borax. (7) with carb. soda. -- (8) Special reactions. -- * * * * * Mineral. Uranite Formula. ([.Ca] +[...U=]^{2})[.....]P + 8[.H]. Behavior (1) in glass-bulb. Evolves water and becomes yellow and opaque. (2) in open tube. -- (3) on charcoal. Fuses with intumescence to a black bead having a semi-crystalline surface. (4) in forceps. -- (5) in borax. Gives the uranium reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Forms an infusible yellow slag. (8) Special reactions. Gives the PO^{5} reaction. * * * * * Mineral. Chalcolite Formula. ([.Cu]+[...U=]^{2})[.....P] + 8[.H]. Behavior (1) in glass-bulb. As uranite. (2) in open tube. -- (3) on charcoal. As uranite. (4) in forceps. As uranite. (5) in borax. In the oxidizing flame gives a green bead, which in the reducing flame becomes of an opaque red, from Cu. (6) in mic. salt. As in borax. (7) with carb. soda. In reducing flame yields a metallic bead of Cu. (8) Special reactions. As uranite. * * * * * IRON. * * * * * Mineral. Iron pyrites Formula. FeS^{2}. Behavior (1) in glass-bulb. Gives a considerable yellow sublimate of sulphur, and sometimes sulphide of arsenic. Also HS. (2) in open tube. Sulphurous acid and sometimes arsenious acid are evolved.