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XlMtflTE. 277 b C d 62'86 62-68 62-77 27-64 27-22 27-13 9'50 10-10 10-10 a Manganese . . 1 89 . g3 Oxygen . ... j Water io - 08 In attached and imbedded crystals, columnar and granular masses. Occurs in irregular veins in porphyry with pyrolusite and other ores of manganese, baryte, calcite and rarely aragonite ; also in veins in gneiss with quartz, and in beds of chalybite and hydrous iron oxides ; occasionally in the cavities of amygdaloidal trap. Is found in veins in gneiss near Ihlefeld in the Harz, II- menau and Oehrenstock in Thuringia, Aberdeenshire, Christian- sand in Norway, Undeniis in Sweden, Nova Scotia. It appears to result sometimes, together with gotbite, from the decomposition of chalybite, when the latter contains kohle- rite. It is frequently converted into pyrolusite, its colour, hardness and specific gravity being changed at the same time. An intimate mixture of manganite and pyrolusite sometimes occurs in pseudomorphous forms after calcite; this mixture appears to be identical with the substance called varvicite. 150. TUKGITE.—Turgit; Hausmann, Haidinger. Fracture even, conchoidal. Opaque. Dull. Brownish-red. Streak blood-red, shining, h = 6’0. a = 3-56...374. In the matrass yields water. Before the blowpipe becomes darker, but undergoes no farther change. The reactions with fiuxes are the same as those of pure red oxide of iron. j&sUI, red oxide of iron 95 27, water 473. Analysis by Hermann:— Ked oxide of iron .... 85'34 Water 6'3i Oxides of copper and lead . T85 Silica and insoluble matter . 7'60 Occurs massive in the Turginsk copper mines near Bogos- lowsk in the Ural, and in those of Solotuschenskoi in the dis trict of Kolywan in the Altai. 151. LIMNITE.—Brown hematite; Phillips. Per oxide hydrate; llauy. Untheilbares Habronem-Erz; Mohs. Brau- ueisenstein ; Hausmann. Limonit ; Haidinger. Limnit ; Glocker.
