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salt. As in borax. (7) with carb. soda. The alkali is absorbed leaving the magnesia on surface of the charcoal. Gives the sulphur-reaction on silver. (8) Special reactions. The magnesian residue obtained on treating with carbonate of soda (7), assumes a flesh-tint, when treated with cobalt. * * * * * Mineral. Boracite Formula. [.Mg][...B]^{2} + 2[.Mg][...B]. Behavior (1) in glass-bulb. Occasionally gives off a trace of water. (2) in open tube. -- (3) on charcoal. Fuses with intumescence to a white crystalline bead. (4) in forceps. I. As on charcoal. Colors the flame green. (5) in borax. Fuses easily to a clear bead, which is crystalline, when containing much of the mineral, and is usually slightly tinted by iron. (6) in mic. salt. As in borax. (7) with carb. soda. With a small quantity of alkali fuses to a clear bead on cooling. With a larger quantity gives a clear, uncrystallizable bead. (8) Special reactions. -- * * * * * Mineral. Magnesite Formula. [.Mg][..C]. Behavior (1) in glass-bulb. Sometimes gives off a small quantity of water. (2) in open tube. -- (3) on charcoal. Is infusible. With cobalt-solution, assumes a dusky flesh tint. (4) in forceps. -- (5) in borax. Behaves as magnesia. Sometimes a slight iron-reaction. (6) in mic. salt. As in borax. (7) with carb. soda. Fuses to a bead, the soda is then absorbed, leaving an infusable mass of magnesia. (8) Special reactions. The magnesian residue obtained by fusing with carbonate of soda gives the magnesian-reaction with nitrate of cobalt. Dissolves with effervescence in warm HCl. * * * * * Mineral. Mesitine spar Formula. ([.Mg][.Fe][.Mn])[..C]. Behavior (1) in glass-bulb. As magnesite. (2)
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