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526 ARSENIC. Geognostic Situation. It occurs principally in veins in primitive rocks, as in gneiss, mica-slate and clay slate. It is frequently asso rted with red silver-ore, silver-glance or sulphureted sdver-ore, arsenical pyrites, orpiment, and galena or lead- , glance ; sometimes also along with native silver, silver- white cobalt-ore, grey copper ore, grey antimony-ore, copper-mckel, sparry ironstone, iron-pyrites, cot.per-py rites, heavy-spar, calcareous spar, brown-spar, fluor-spar, and quartz. • Geographic Situation. ' ' Europe. It occurs at Kongsberg in Norway, along with ores of silver, cobalt, and antimony, at Andreasberg m the Hartz, and Allemont in France: in veins along with red silver ore, in mica-slate, at Joachimsthal in Bo hemia, and with the same mineral in gneiss, at Frevber* in Saxony, and at St e Marie aux Mines in France,* and it is also found in Silesia, Swabia, Spain and Hungary. Asm—In large masses at the bottom of a silver-mine at Zmeof in Siberia. America.—In Chili. 2. Arsenical Pyrites. Arsenikkies, Werner. This species is divided into two subspecies, viz. Common Arsenical Pyrites, and Argentiferous Arsenical Pyrites. First