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CALCEDONY. 201 Calcedony. Kalzedon, Werner. This species is divided into four subspecies, viz. Conk* mon Calcedony, Chrysoprase, Plasma, and Garnelian. First Subspecies. Common Calcedony. Gemeiner Kalzedon, Werner. Achates chalcedonius, Wall. 1.1. p- 287. Calcedoine, R. dc L. t. 2. p. 145.—Gemeiner Chalzedon, Wid. p. 317- Common Chalcedony, Kiriv. vol. i. p. 298.—Chalcedon, Eslner, b. n. s. 868. Id. Emm. b. i. s. 151.—Calcedonia, Nap. p. 188.— l.a Calcedoine, Lam. t.ii. p. 142. Id. Broch. p. 268.—Quartz- agathc calcedoine, Hatty, t. ii. p. 425.—Gemeiner Chalcedon, Iieass, b. ii. p. 271. Id. Lud. Suck. Bert. Mohs, b. i. s. 27S. Id. Karsten, Tabell. s. 24. Id. Leonhard, Tabell. s. 10.— Quartz-agathe calcedoine, Lucas, p. S3.—Silex calcedoine, Bron%. t. i. p. 298.—Quartz-agathe calcedoine, Brard. p. 96. —Calcedony, Kid, vol. i. p. 217-—Calcedoine, IIany, Tabl. p. 26.—Gemeiner Kalcedon, Steffens, b. i. s. 153. Id-iHoff. b. ii. s. 108 Id Lenz, b. i. s. 385.—Chalcedon, Oken. b. i. s. 266. External Characters. • Its most common colour is grey, of which the follow ing varieties occur: smoke-grey, bluish-grey, pearl-grey, greenish-