5 oS ' CALC GENUS. 1 FIFTH SPECIES. Slate Spar. Schiefer Spath.—Werner. Id. Wid. f. 513."-Argentine, Kirw. vol. 1. p. ioj Schifto fpatho, Nap p. 355 Sch ffer fpath, Lam• t. *• p. 385.—Le fpath ichiileux ou le fchiefer fpath, Br° c ^' t.i. p. 558. External Characters. Its colour is milk, greenifh and reddifh white. Maffive. Luftre intermediate between Aiming and glifteni fl S' ?nd is completely pearly. Fra&ure pretty perfedly common curved foha te ’ approaching fometimes to ftraight flaty, fometim eS undulating flaty ; cleavage is Tingle. Fragment;, flaty. ^ Exhibits fometimes a tendency to large, and c °^ f grained diftind concretions, feldom curved lam® diflincl concretions. Tranflucent. Intermedi atc