TURQUOIS STONB. 183 



^ork^; in which I am indebted to the kindness of the cele- 

 brated mineralogist M. Haiiy. 



Turkis (turquois) Reuss, pag-e 511, part 2, vol. 3. 



The Turquois has always been considered as the toolh of Various ac- 

 an unknown animal, of which the sky-bjue colour depends on [^°,!J"J^i5^^ ^y 

 oxide of 'copper; or, according toothers, on oxide of iron ; different au- 

 which has caused it to be ranked in the calcareous order, and ^^ors. 

 sometimes in that of copper, as animal petrefaction (odonta- 

 lite.) 



Lommer, in the Abhandlungen einer Frivat-Gesellschaft in Boeh- 

 incn, 2 vol. page 1-12, US, thinks the turquois is a produce of 

 art. He asserts, that a toolh found in the neighbourhood of 

 Lissa, in Polomie, being exposed to a strong heat in the muffle 

 of an assayer's furnace, became converted into a turquois; and 

 he recommends the heat to be very gradually raised, for fear 

 (he tooth should fly in pieces. 



Bruckman gives a complete history of all that has been Supposition 

 written from Pluds to Lommer, on the turquois. He mentions that the tur- 

 ^ , r • • 1 1 1- . c r quois is not an 



mount Caucasus as a place oi origin, at the distance ot tour a^iji^ai sub- 

 days journey from the Caspian Sea ; where, according to Chai- stance. 

 din, this stone is dug up. It is likewise in Persia, Egypt, 

 Arabia, and in the province of Samaveande. 



Dambsy brought it from PerCi ; some of them contained na- 

 tive silver. 



The occidental turquois is found in France, at Simore, in 

 Lower Languedoc, in Bohemia, in Siberia, and in Hungary. 



Demetrius Agaphi, who visited the place where the tur- 

 quois is found, near Chorasen, in the neighbourhood of the 

 town ofPishepure, relates, in the fifth volume der Nordischen 

 Beitrage, 1793, page 2Si, that the turquois is found in a stone 

 as its matrix, in masses and small points ; and that it might be 

 considered as a peculiar mineral, which ha;, the same situations 

 as opal, the chrysophane, and the resiniform quartz. 



Mr. Bruckman, in Crdl's Chtmical Journal, 1799, vol. 2, 

 page 18S to 199, thinks, from the nature of its position at Cho- 

 rasan, and after the analysis at Lametz, that the turquois is 

 not a petrefaction of parts of animals, but a particular mineral. 



Lonsitz obtained from it, by analysis, much clay, a little cop- 

 per, and iron; but neither lime, nor phosphoric acid *. 



S 4 According 



* I do not know whether the substance analyzed by M. Lowitz, 



