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RADIATED RED COB ALT-OCHRE. 513 Chemical Characters. Before the blowpipe it becomes grey, and emits an ar senical odour, and tinges borax glass blue. Constituent Parts. Cobalt, - - 39 Arsenic Acid, - 38 Water, - - 23 100 Bucholz, in J. d. Min. t. 25. p. 158. Gcognostic Situation. It occurs in veins, in primitive, transition, and fln.tz rocks, along with silver-white cobalt, tin white cobalt, grey cobalt, urn! other ores of cobalt; also with copper- flickel, nickel-ochre. copper pyrites, grey copper ore, a zure copper ore, ironshot copper green native bismuth, brown ironstone, galena or lead-glanee, and blende ; the v ein-stones are heavy-spar, calcaieous-spar, brovvn-spar, bornstone and quartz. Geographic Situation. It occurs in veins in floetz rocks at Alva in Stirling shire ; i n limestone of the coal formation in Linlithgow- s hire; formerly in small veins in sandstone of the coal formation, along with galena and blende, at Broughton ,n Edinburgh ; in the Clifton lead mines, near Tyndrum, Already described ; and at Dolcoath in Cornwall. On foe Continent, it is met with at Modum in Norway, Itie- Vol. Hi. K k . gelsdorf