1819.] the Turquoise and the Calaite. 409 



Fischer, Gotthelf, sur la Turquoise Orientale. See Mem. de 

 la Soc. Imper. des Naturalistes de Moscou. Vol. i. de la 

 Seconde Edition, p. 140—149. 



John, J. F. Experience et Analyse Chimique de la Turquoise; 

 ibid. n. xviii. p. 131 — 139. Bemerkungen iiber den Tiirkis in s. 

 Chem. Untersuchungen. B. i. n. xxv. p. 190 — 192. In Gehlen's 

 Journal fur die Chemie u. Physik, iii. 1. 93. 



Blumenbach, in v. Moll's neuen Jahrb. der Berg. u. Hiitten- 

 kunde, ii. 275. 



Authors who have treated of the Turquoise vulgarly so called, or 

 of the Turquoise Odontolite. 



Guy de la Brosse, sur la Nature et l'Utilite des Plantes. 

 Paris, 1628, p. 421. 



Mortimer, Cromwell, Remarks on the precious Stone called 

 the Turquoise. Phil. Trans. No. 482 and 483, p. 429. 



Reaumur, Observations sur les Mines des Turquoise du Roy- 

 aurae sur la Nature et la Maniere dont on lui donne la Couleur. 

 Mem. de l'Acad. des Sciences de Paris, 1715. P. 174—202. 



Lommer in der Abhandlungen einev Privatgesellschaft in Boh- 

 men, ii. p. 112. — The author pretends that the turquoise is an 

 artificial production. 



Briickmann's Abhandlung von Edelsteinen, p. 329 — 341. 

 1 Forts, p. 246-247. 2 Forts, p. 247—248. 



Cuvier, G. Extract d'un Ouvrage sur les Especes de Quadru- 

 pedes dont on a trouve les Ossemens dans lTnterieur de laTerre, 

 an. 9. 4. p. 6. 



Emmerling's Mineralogie, ii. p. 270. 



Kinvan's Mineralogy, ii. 190. 



Reuss's Mineralogie, ii. 3, p, 511. 



Haiiy's Traite de Mineralogie, iii. 570. 



Brochant, Traite Element, de Mineralogie, ii. 212. 



Suckow's Mineralogie, ii. 227. 



Patrin, sur la Turquoise, Diet, et Hist. Nat. Art. Turquoise. 



Bouillonla Grange, Ann. de Chimie,lix. 180. 



Klaproth and Wolf, Diet, de Chimie. Art. Turquoise. 



It is unnecessary to say here that the artificial turquoise, or the 

 imitation of it by a paste, cannot enter into this dissertation. I 

 shall have an opportunity of showing that all the turquoise odon- 

 tolites have undergone a change of some kind or other by the 

 action of fire, and in this point of view ought to be considered 

 as artificial, at least in part. 



The name turquoise seems to be owing to this, that those 

 from Turkey were first known. 



The object of this essay on the turquoise, of which I have 

 already communicated the principal ideas to the Imperial Society 

 of Naturalists, who have printed them in their Memoirs, and the 

 principal interest of which depends upon the analysis of my 

 > Bteemed friend Dr. John, is to assign the calaite a place in the 



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