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136 Limestone family. Third Kind. ' ' Roestone. Roogenstein, Werner. Stalactites oolithus, var. b. c. d. Wall. t. ii. p. 381.—Roogen- stein, H id. s. 511.—Oviform Limestone, Kirn-, vol. i. p. ,91. —Roogenstein, Eslner, b. ii. s. 928. Id. Emm. b. i. s. 112. —Tufo oolitico, Nap. p. 353.—L'Oolite, Brock, t. i. p. 529- —Chaux carbonatee globuliforme, Ilauy, t. ii. p. 171 genstein, Reuss, b. ii. 2. s. 270. Id. Lud. b. i. s. 148. Id. Suck, lr th. s. 591. Id. Bert. s. 89. Id. Mohs, b. ii. s. 26. Id. Ilab. p. 72. Id. Leonhard, Tabel. s. 32.—Chaux carbo- bonatee oolithe, Brong. t. i. p. 203.—Chaux carbonatee glo buliforme, Brard, p. 31.—Erbsformiger Kalkstein, Karslen, Tabel. s. 50.—Roestone, Kid, vol. i. p. 26.—Chaux carbo nate globuliforme, Hauy, Tabl. p. 4.—Roogenstein, Lenz, b. ii. s. 738. Id. Okcn, b. i. s. 411. External Characters. Its colours are hair-brown, chesnut-brown, and reddish- brown, and sometimes yellowish-grey, and ash-grey. It occurs massive. Internally it is dull. The fracture of the grains is fine splintery ; but of the mass is round granular in the small, and slaty in the large. The fragments in the large are blunt-edged. It is composed of globular concretions, which have sometimes a rough or uneven, sometimes a smooth surface, and vary in size from that of a cherry-stone to that of a millet seed. These concretions have in general a central nucleus, which is either of compact limestone, or of iron- ore