100 SERPENTINE. 1. II. hi. IV. Dark Green, Green Homo- Red, Kynance Light Green Col de Pertuis, geneous, Oxford Canada (4). Bay Cornwall (1 . Galway (2). Vosges (3). Silica ... 38.29 .. 40.12 . .. 40.83 .. .. 40.30 Alumina — 2.00 0.92 — Protox. Iron • •• 13-5° • ■ ■ 3-47 ... 7.39 . 7.02 Oxide Manganese. — — trace . 0.26 Oxide of Chromium — — ... 0.68 .. trace Lime — — ... 1.50 .. — Magnesia ... 34.24 .. .. 40.04 ... 37.98 .. • ■ 59-07 Water, &c. 12.09 13.36 10.70 •• 1335 g8.i2 98.99 100.00 100.00 (1) Haughton, Phil. Mag. x. 253. (2) Bristow. Glos Mineral. (3) Delesse. Ann. des Mines, xviii. 341. (4) Hunt, Anier. Journ. Sci. xxv. 219. England and Wales—The Lizard, Cornwall. The serpentine of this district has come into great and just repute within the last thirty years. It forms a large tract of the Lizard promontory, and is associated with diallage rock and hornblende schist. Its relations to these rocks are somewhat obscure, notwithstanding the careful investigations of Sir H. T. De la Beche. 1 In some places the hornblende rock appears to graduate upwards into the serpen tine ; in others, masses of serpentine appear to have been intruded amongst the hornblende rock. It is probable, however, that all these phenomena may be accounted for by considerations connected with the intensity of the metamorphism to which the rocks of the district have been subjected. The serpentine of the Lizard is extremely variable in colour. The principal mass, like that of some other 1 Geology of Cornwall, Devon, and Somerset, p. 30 (1839).