Bafanfti. 3°7 tnixed with argill as to feem to pafs into it, as in Lelke G. 154. It feems to be nothing more than a flaty, and at the fame time rifty, hornftone; the rifts lined with calx of iron. 2d Variety. Bafanite. Lydian Stone of Werner. Black Jaf- per of Some. Its colour, dark greyifh black, frequently in- terfedled with veins of quartz. It is generally found in blunted fragments in the beds of rivers. Luftrc, fcarcely 1. Tranfparency, o. Fradture, moftly even, fometimes indining to the conchoidal. Fragments, 3. Hardnefs, 10. Sp.gr. 2,596. When pounded, its powder is black. Heated to 164,5°, it remained black, and fhewed 110 fign of fulion. 3d Variety. Hornllate, of Charpentier and Voight. Schiftofe Porphyry of Werner. Its colour is grey, of different fhades, from the afh, to the bluifh, or olivc green. As this grey confifts of two colours, the white and blue, the ftone itlelf is looked on by Mr. Werner äs an aggregate, and the white he confiders as denoting feffpar; and hence he calls it a porphyry; and, r X a becauie