Min. Obs. [f. L. ferr-um + -(I)LITE.] = ROWLEY RAG.
1799. Kirwan, Geol. Ess., 200. Again, 50 Silex, 30 Argil, 15 Calx, 5 Iron should I imagine give wacken, Charp. 186; this is sometimes efferverscent, ibid. and if the calx be eliminated, and in its place, iron substituted, ferrilite will result.
1804. Watt, in Phil. Trans., XCIV. 281, note. Mr. Kirwan states the specific gravity of rowley rag, which he calls ferrilite, at 2.748; and assigns its melting point at 98° of Wedgwood’s pyrometer.
