32 k manganese. Geognostic Situation of the Species. Ihis mineral occurs in granite, gneiss; mica-slate, por phyry, and sandstone, eitlier in veins, or in large irn- edded cotemporaneous masses. Several different for mations are enumerated and described by mineralogists: m one formation, which is in porphyry, the ores, which are principally the radiated and foliated subspecies, occur m veins, along with heavy-spar; and in another, the ores, principally the compact and earthy subspecies, are in veins, along with red and brown ironstone. Uses. It is added to glass, in small quantity, when we wish to destroy the brown colour which that material receives from intermixed inflammable substances, or in larger quantity when we wish to give to it a violet-blue colour. t affords a fine brown colour, which is used for painting on porcelain. It is employed in the laboratory, as the c ea ptst and most convenient material from which to Procure oxygen gas. All the oxymuriatic acid used in 0Ues ’ am * * or t ^ ie purpose of destroying contagious tenM 01 * !- S I,repared from manganese, and the usual 1114* s of muriatic acid. 2 - Black Manganese-Ore. Schwarz Braunsteinerz, Werner. This species is divided i„ t „ tIlrce ^ ^ L1.C C Manganese ore, Fdi.M Black Manganese-ore, <md Dendritic Black Manganese-ore First