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XXI LIMESTONE FAMILY. This Family contains the following species: Tabular- Spar, Slate Spar, Aphrite, Agaric Mineral, Chalk, Lime stone, Lucullite, Marl, Bituminous Marl-Slate, and Ar- ragonite. \ 1. Tabular-Spar. Schaalstein, Werner. Tafelspatb, Karsten. Tafelspath, Rems, b. ii. s. 435. Id. Lucl. b. ii. s. 144. Id. Suck. l r til. s. 422.—Schaalstein, Her I. s. 166. Id. Molts, b. ii. s. 1.-3.—Tafelspath, Leonhard, Tabcl. s. 35. Id. Kar- s(en, Tabel. s. 44.—Spath en tables, Haw/, Tab!, p. 66.— Schaalstein, Lenz, b. ii. s. 763.—Spathiger Conit, Oken, b. i. s. 392. External Characters. Its most common colour is greyish-white, which passes into greenish and yellowish white, and reddish-white. It occurs massive, and crystallised in rectangular four sided tables. The lustre of the principal fracture is shining and pearly. The principal fracture is foliated, with a single cleavage, and inclines to coarse fibrous and splintery. It occurs in prismatic distinct concretions, which arc long, thick, and broad, and promiscuously aggregated, and sometimes pas3 into granular. It