971 RED hematite. The fragments are commonly cuneiform, seldom, as in the coarse fibrous, splintery. It generally occurs in distinct concretions, which are large, small or fine angulo-granular, and traversed by others which are curved lamellar: more rarely it occurs in cuneiform prismatic concretions. The surface of t le concretions is either smooth or streaked, and the colour inclines to iron-black, with a shining and metallic lustre. The streak is always blood-red. It is hard, passing into semi-hard. It is brittle. It is rather easily frangible. It is heavy, inclining to uncommonly heavy. Specific gravity, 4.740, Gcllert. 5.005 *r*». 4.8983, Brisson. 4.840, Wiedemann. 5.025, Ullmann. •1 Constituent Parts. Oxide of Iron, Trace of Oxide of Manganese, Silica, - Lime, - Water, - Dauluisson, Ann. de Lhimie, Sept. 1810. 90 94 2 2 1 a trace 3 2 96 9S Geognostic Situation. It occurs in every situation where the compact sub species is found, and like it in veins, beds, and lying masses (liegende stdclce) that approach in magnitude to mountain-masses, principally in primitive mountains, but also in transition and fleet z mountains. The different subspecies