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13 * LIMESTONE FAMILY. ores as are difficultly fusible owing to an intermixture of silica and alumina. Second Kind. Blue Vesuvian Limestone. Blauer Vesuvischer Kalkstein, Klaproth. Blauer Vesuvischer Kalkstein, Klaproth, Beit b. v. s. 92. Id. Lenz, b. ii. s. 737. External Characters. Its colour is dark bluish-grey, partly veined with white. Externally it appears as if it had been rolled ; and the surface is uneven. The fracture fine earthy, passing into splintery. It is opaque. It affords a white streak. It is semi-hard in a low degree. It is rather heavy. Constituent Parts. Lime, - 58.00 Carbonic Acid, 28.50 Water, which is somewhat ammoniacal, 11.00 Magnesia, 0.50 Oxide of Iron, 0.25 Carbon, 0.25 Silica, 1.25 99.75 Klaproth, Beit. b. v. s. 96. l’rom