(8) Special reactions. Generally gives the manganese reaction with nitre and carbonate of soda. * * * * * Mineral. Chloropal Formula. [...Fe=][...Si]^{2} + 3[.H]. Behavior (1) in glass-bulb. Decrepitates more or less, gives off much water and turns black. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. Loses color and turns black. (5) in borax. Gives the iron reaction. (6) in mic. salt. Gives the iron and silica reaction. (7) with carb. soda. Fuses to a transparent green glass. (8) Special reactions. -- * * * * * Mineral. Green earth Formula. [...Si],[.Fe],[...Al=],[.Na],[.K],[.H], etc. Behavior (1) in glass-bulb. Gives off water and becomes darker in color. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. In reducing flame fuses on edges and colors the outer flame yellow ([.Na]) or violet ([.K]). (5) in borax. As the preceding. (6) in mic. salt. As the preceding. (7) with carb. soda. Forms a slaggy mass. (8) Special reactions. -- * * * * * Mineral. Siderite Formula. [.Fe][..C]. Behavior (1) in glass-bulb. Occasionally decrepitates. Gives off CO^{2} and turns black and magnetic. (2) in open tube. -- (3) on charcoal. As in glass bulb. (4) in forceps. Behaves similarly to the magnetic oxide. (5) in borax. Gives the iron and manganese reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Behaves as an oxide. With nitre and carbonate of soda on platinum generally gives the manganese reaction. (8) Special reactions. In acid dissolves with effervescense. * * * * * Mineral. Copperas Formula. [.Fe][...S] + 7[.H]. Behavior (1) in glass-bulb. Gives off water, and, when strongly heated, SO^{2} and SO^{3}, which reddens litmus paper. (2) in open tube. Evolves water and SO^{2}, which may be recognized by its odor. (3) on charcoal. Loses water and SO^{2}, and is converted into [...Fe=]. (4) in forceps. Gives off H and SO^{2}, and then behaves as the magnetic oxide. (5) in borax. The roasted mineral affords an iron reaction. (6) in mic. salt. As in borax.