(4) in forceps. Fuses to a translucent violet colored bead, the color being due to cobalt. Colors the flame blue at first, then faintly red. (5) in borax. Dissolves readily to a bead strongly colored by cobalt, which obscures the lime-reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses, and emits As. The alkali is then absorbed by the charcoal, as in the preceding. (8) Special reactions. -- * * * * * Mineral. Calespar Formula. [.Ca][..C]. Behavior (1) in glass-bulb. Turns white and sometimes decrepitates. Strongly heated loses CO^{2} and becomes caustic. (2) in open tube. -- (3) on charcoal. Turns white, or brown if containing much iron or manganese and glows brilliantly. (4) in forceps. Glows brilliantly, coloring the flame red. Becomes caustic and shows a strong alkaline reaction. (5) in borax. Dissolves with evolution of CO^{2} and when pure gives the lime-reaction. The bead is generally more or less colored by iron and manganese. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses, and behaves as other lime-salts. (8) Special reactions. Dissolves with effervescence in cold HCl. * * * * * Mineral. Fluorspar Formula. CaFl Behavior (1) in glass-bulb. Phosphoresces with various colors, when heated in the dark. (2) in open tube. -- (3) on charcoal. Fuses easily to a clear bead, which becomes opaque on cooling, then loses fluorine, glows brilliantly and becomes infusible. (4) in forceps. As on charcoal. Colors the flame red. (5) in borax. Gives the lime-reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses to a clear bead, opaque on cooling. With an addition of the alkali behaves as lime. (8) Special reactions. With microcosmic salt in open tube gives the fluorine-reaction. * * * * * MAGNESIA. * * * * * Mineral. Brucite Formula. [.Mg][.H]. Behavior (1) in glass-bulb. Evolves water. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. (5) in borax. Behaves as magnesia. Sometimes gives a faint iron-reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Behaves as magnesia.