Volltext Seite (XML)
FLINT. m Chemical Characters. before the blow-pipe, it is infusible without addition. Constituent Parts. Silica, 98.0 98. Lime, 0.50 0.50 Alumina, 0.25 0.25 Oxide of Iron, 0.25 0.25 Loss, 1.00 1. 100 loo Klaproth, Beit. b. i. s. 46. Vauquelin, Journ. de Mines, n. xxxiii. p. 702. Physical Characters. When two pieces of flint are rubbed together in the *Wk, they phosphorise very much, and emit a peculiar •niell. Georrnostic Situation. © !• It occurs in primitive, transition, flcetz, and alluvial tocks. In primitive and transition rocks, it occurs in Metalliferous and agate veins. The metalliferous veins ^°ntain in some instances ores of silvet or of cobalt, ln others ores of iron; and the agate veins are com posed of flint, calcedony, jasper, amethyst and quartz. n floetz countries, where this mineral occurs in great- e *t abundance, it is found in sandstone, limestone, chalk, “Ml amygdaloid. The sandstone is that variety known Under the name of Puddingstons: the limestone is one of the newer floetz rocks, in which the flint appears in °ds, imbedded masses, and veins: in chalk' it occurs N 3 in