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R.ENIFORM CLAY IRONSTONE. 289 Sixth Subspecies. Keniform or Kidney-shaped Clay-Ironstone. Eisenniere, Werner. ■®tites, Wall. t.ii. p. 614.—Pierre d’Aigle, Rome de Lisle, t. m. p. ,100.—Eisenniere, Werner, Pabst. b. i. s. 167- Var. of Iiohnerz, Wid. s. 827.—Nodular Ironstone, Kirrv. vol. 11. p. 178, Ecr limoneux spheroidal, I)e Born, t. ii. p. 283. Eisenniere, Emm. b. ii. s. 344.—Pierre d'Aigle, Lam. t. i. p. 04,5, Per oxyde rubigineux geodique, llauy, t. iv. p. 107, &c—La Per reniforme, Brock, t. ii. p. 278—Eisenniere, Reuss, b. iv. s. 132. Id. Lnd. b. i. s. 253. Id. Suck. 2ter th. a - 286. Id. Bert. s. 423. Id. Mohs, b. iii. s. 425. Id. Leon hard, Tabel. s. 67.—Fcr oxide brun sctite, Brong. t. ii. p. 169. —Schaaliger Thoneisenstcin, Karslen, Tabel. s. 66—Schaali- ger Gelbcisenstein, 11 an s. s. 107-—-Elites or Eaglestone, Kid, vol. ii, p. 181.—Fcr oxyde geodicjue, Ilauy, labl. p. 93. External Characters. Its colour is yellowish-brown, but it shews various de grees of intensity, even in the same specimen : externally h is darker, approaching to blackish-brown ; internally the colour is very light, and sometimes it includes an ochre-yellow kernel. It occurs in masses, which are blunt-angular, roundish, tuberose, or more or less inclining to reniform. The lustre of the external layers is glimmering and se mi-metallic ; that of the internal layers is dull. The fracture towards the interior is tine earthy; to wards the exterior, even ; in the dark yellowish-brown varieties, nearly conchoidal; that of the oclue-yellow, even. Vol. III. T The