434 TALC GENUS. Fragments wedge fhaped, feldom fplintery. Cleavage fingle. Iranflucent, but tranfparent in thin leaves. It occurs in large, coarfe, fmail, and fine grained diftinft concretions, but more frequently unfeparat- ed. Flexible, but not elaftic. Very foft. Perfe&ly mild. — : Eafily frangible. Feels very greafy. 1 Is not particularly heavy, approaching to light. It is infufible before the blow pipe without ad» dition, a character which diftinguiihes it from chlorite. Brochant. Chemical Character. Constituent Parts Magnefia 44.00 50.00 6,00 Silex Alumina According to Hccpfuer, Helv. Mag. iv. s. 296. It