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318 LIMESTONE FAMILY. i Observations. It is characterised by its lustre, fracture, and distinct concretions. The lamellar concretions, according to Bournon, are but varieties of the primitive rhomboid of calcareous-spar ; so that in this view, each concretion is a perfect crystal. 3. Aphrite. Schaumerde, Werner. This species is divided into three subspecies, viz. Scaly Aphrite, Slaty Aphrite, and Sparry Aphrite. First Subspecies. Scaly Aphrite. Schaumerde, Werner. Zerreiblicher Aphrit, Karsten. Schaumerde, Emm. b. i. s. 484.—Silvery Chalk, Kirw. vol. j. p. 78—L’Ecumc Me Terre, Brock, t. i. p. 557.—F.cume de Terre des Allemands, IIany, t. iv. p. 3fi0—Schaumerde, Ecuss, b. ii. 2. s. 317. Id. Lud. b. i. s. 152. Id. Suck, lr th. s. 625. Id. Bert. s. 95. Id. Mobs, b. ii. s. 6. Id. Hub. s. 80. Id. Leonhard, Tabel. s. 34.—Chaux carbonatee nacre tal- quese, Brong. t. i. p. 252.—Zerreiblicher Aphrite, Karsten, Tabel. s. 50.. Id. Hans. s. 126.—Chaux carbonntee nacr6e lavncllairc, Hatty, Tabl. p. 6—Schuumkalch, Lenz, b. ii. s. 757-—Erdigc Schaumerde, Oken, b. i. s. 394. External Ckaraetcrs. Its colours are snow, yellowish, and reddish white, sometimes passing into silver-white. It
