HUMITE. 421 2. Humite, Humite, Bournon. Id. Bournon, Cat. Min. p. 52. External Characters. Its colour is reddish-brown. It occurs crystallised in octahedrons, which are always more or less truncated and bevelled. The planes are frequently transversely streaked. Its lustre is shining. It is transparent. It scratches quartz with difficulty. Geognostic and Geographic Situations. 'It occurs at Somma, near Naples, in a rock composed of grey coloured granular topaz, mixed with grains of pale yellow and green topaz, which latter is sometimes crystallised in cavities; also with brown and olive-green mica, und white hauyne. Obsercatmis. The preceding account is from Bournon’s Catalogue Mincralogique, and it contains all that is known of' the species. It was named by Bournon in honour of Sir Abraham llume, Baronet, a zealous cultivator of mine- ralogy, and possessor of one of the most valuable and splendid mineralogieal cabinets in England. n a 3 3. Fibrolite,