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GREY COPPER-ORE* 125 From Airthrie. t'oppcr, 19.2 Iron, 51.0 Sulphur, 14--1 Arsenic, 15.7 100.0 Thomson, Ed. Trans. Constituent Parts. Freyberg. Copper, 41.00 Iron, 22.50 Sulphur, 10.00 Arsenic, 24.10 Silver, 0.40 Antimony, 98.00 Klaproth, Beit, b. iv. s. 47. Freyberg. Freyberg. 48.00 42.50 25.50 27.00 10.00 10.00 14.00 15-60 0.50 0.90 1.50 98.00 98-00 lb. s. 49. lb. s. 52. Gcognosiic Situation. It occurs in beds and veins, in primitive, transition, atbl flcctz rocks, in which it is usually accompanied with cop- per-pyrites, galena or lead-glancc, ores of manganese, sparry ironstone, heavy-spar, calcareous-spar, tluor-spar, and quartz ; seldomer with malachite, azure copper ore, and other ores of copper. Geographic Situation. Europe.—It occurs along with copper-pyrites in red sandstoue, near Sandlodge, in the Mainland of Zet land ; in small veins at Fassney Burn in East Lothian ; at Airthrie, in the Oehil Hills, north-east of Stirling, in veins, along with heavy-spar, and calcareous-spar; al : so in Ayrshire; and at Tavistock in Devonshire; and in the copper-mines of Cornwall; at Kongsberg in Nor way,-along with variegated copper-ore; at Freyberg m Saxony, in veins that traverse gneiss, along with copper- pyrites, sparry ironstone, quartz, calcareous-spar, heavy spar.