Formula. [.Fe]^{3}[.....As] + [...Fe=]^{3}[.....As]^{2} + 18[.H]. Behavior (1) in glass-bulb. Evolves much water. (2) in open tube. As the preceding. (3) on charcoal. As the preceding. (4) in forceps. As the preceding. (5) in borax. As the preceding. (6) in mic. salt. As in borax. (7) with carb. soda. As the preceding. (8) Special reactions. As the preceding. * * * * * MANGANESE. * * * * * Mineral. Manganblende Formula. MnS. Behavior (1) in glass-bulb. -- (2) in open tube. Gives off SO^{2} and becomes greyish green on surface. (3) on charcoal. Is slowly roasted and converted into oxide. (4) in forceps. V. (5) in borax. The roasted mineral gives a strong manganese reaction. (6) in mic. salt. In the unroasted state, dissolves with much ebullition and detonation due to elimination of sulphide of phosphorus. The bead then exhibits the characteristic violet color of manganese. (7) with carb. soda. Forms a slaggy mass, which laid on silver and moistened, gives the sulphur reaction. (8) Special reactions. -- * * * * * Mineral. Pyrolusite Formula. [..Mn]. Behavior (1) in glass-bulb. Frequently gives off a small quantity of water and, when strongly heated, oxygen. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. (5) in borax. Gives the manganese reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Forms a slaggy mass. (8) Special reactions. -- * * * * * Mineral. Manganite Formula. [...Mn=][.H]. Behavior (1) in glass-bulb. Gives off much water. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. Exfoliates slightly. (5) in borax. As the preceding. (6) in mic. salt. As in borax. (7) with carb. soda. As the preceding. (8) Special reactions. -- * * * * * Mineral. Psilomelane Formula. ([.Ba],[.Ca],[.Mg],[.K]) [..Mn] + [.H]. Behavior (1) in glass-bulb. Gives off water and, when strongly heated, oxygen. (2) in open tube. -- (3) on charcoal. -- (4) in forceps. V. Colors flame faintly green(Ba) and red towards the point (Ca). (5) in borax. As pyrolusite. (6) in mic. salt. As in borax. (7) with carb. soda. As pyrolusite. (8) Special reactions. --