. CLAY GENU’S: SECOND SUBSPECIES. Glofiy Alum Slate. Glazaender Alaunfchiefer.—Werner. Variety of Alaunfchiefer, Wid. p. 395 Glanzender a. fchiefer, Emm.p. 297.— Alaunfchiefer, Eftner, b. f. 6ji Variete de l’argile fchifteufe, Hauy. ■—Ea fchifte alumineux eclatante, Broch. t. 1. p. 388. External Characters. Colours intermediate between bluilh and iron black. On the rents it is marked with a tempered fteel and peacock-tail tarnifli. Occurs maffive. The luftre of its principal fra&ure is' Ihining, g^' tening and femi-metallic. Crofs fra&ure glimmering. Fra&ure pretty ftraight, and partly waved, flaty- Fragments tabular, and often run into wedge- fhaped. In other refpe&s refembling the former, only 3 little more aluminous, Gcognosti 1