Common Flinty Slate. -bi—.. J sltthfT Gemeiner Kiefelfchiefef.-^fewFri ° \ . ji / Tfciirni :;t ! t. \ * Wid. f. 380 Siliceous fchiftus, Kiriu. vol. 1, p. 306.— Kiefelfchiefer, FJlner } \>. a. C.^343. Id. Emm. b. x. f. 178- —Scbifto filiceo, }Tap* p. 244.—Schitle filicieux com- nxun. Broch. t. x. p. 283. , , . La;; ■ .iimnuoxrt noi ; .m'S'n nt absd ni tojso <. g#?-' ,?n.>iifinnux siaoB amdl as j External Gbaraflers. Its principal colour is-^rey,' of which the following varieties occur: afh grev, which pafles into blueifh S re yt from blueHh'grey'tnto pearl'^grdy^and cherry re d, which approaches to blood red. • It is^ pretty often 1 -flamed ahd" fpotted, tfelddtnbr ^tiped, and irregularly clouded. ^ ' i It is often traverfed by quartz veins. It occurs mafiive, in whole beds, and frequently in hlunt angled pieces, which have a fmooth and glim mering furface. Internally it is faintly glimmering, and almoft dull. Fra&ure in the great is generally imperfectly flaty, “hd in the fmall is intermediate between fplintery and Uneven, and fometimes inclines to flat conchoidal. Cc2 Fragments