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20 6 LIMESTONE FAMILY. It is brittle. It is easily frangible. Specific gravity, 2.85S, Iglo, Esmark. 2.8500, Yel lowish-white from Neumarkt, Kopp. 2.9870, Yellowish- white from Auvergne, Kopp. 2.7500, 3.000, Greyish- white, and Verdigris-green from Schwaz, Kopp. Geognostic and Geographic Situations. It occurs in trap rocks in Scotland On the Continent of Europe, it occurs at Schwaz in the Tyrol, along with copper-green, grey copper-ore, ochry brown ironstone, iron-pyrites, quartz, and calcareous-spar; near Iglo in Hungary, associated with, calcareous-spar, small botry- oidal calcedony, ocljry-brown ironstone, and copper- green ; near Schemnitz, accompanied with brown-spar, brittle silver-ore, lead-glance, Sic.; at Saalfeldt, with compact brown ironstone; also at Joachimsthal in Bo hemia ; in a vein in basaltic amygdaloid, at the ruins of the castle of Limburg, near the Kaiserstuhle in the Breis- gaw ; in the Leogang in Salzburg, in acicular crystals, superimposed on brown ironstone, along with azure cop per-ore, and pyramidal calcareous-spar; in common com pact limestone on the Wolfstein, near Neumarkt in the Upper Palatinate; in a limestone quarry, along with brown-spar, at Marienberg, in the Saxon Erzgebirge, &c. The beautiful coralloidal variety known under the name Flos ftrri, and which is by some considered as a calc- sinter, occurs in the iron mines of Stiria and Carinthia; at St Marie aux Mines; and in Dufton Fell in Cumber land. America.—In Peru. Asia.— ft occurs in the trap rocks of Van Diemen* Land, and the neighbouring islands. Africa-