222 Analysis of the Substance 
schaft in Boéhmen,” vol. ii. p. 112 and 118, thinks that 
the turquoise is a product of art: he relates that a tooth, 
found in the environs of Lissa, in Bohemia, having been 
exposed to a violent fire under the muffle of an assay fur- 
nace, was converted into turquoise : he strongly recommends 
the precaution of increasing the fire gradually, so as to avoid 
causing the tooth to fly off.in splinters. 
Bruckman has given a complete history of every thing 
which has been written upon turquoises from the days of 
Pliny to those of Lommer: he names Mount Caucasus, 
abont four days’ journey from the Caspian Sea, as the native 
place of turquoises, where there exists, according to Char- 
din, a quarry of them. They are also found in Persia, 
Egypt, Arabia, and in the province of Samarcand. 
Dombey brought some of them from Peru; a few con+ 
tained native silver. 
The turquoise of the western world is found in France 
at Simore in Lower Languedoc, in Bohemia, Silesia, and 
Hungary. 
Demetrius Agaphi, who visited the place where the tur- 
quoises are found near Chorossan, in the neighbourhood 
of the town of Pischpure, relates, in the fifth volume of the 
Nordischen Beytre@ge 1793, p. 261, that turquoise is found 
in a stone as a matrix, in fragments and small pieces, and 
that it ought to be regarded as a particular mineral, which 
lies in the same beds as the opal, the chrysoprase, and the 
resin-formed quartz. 
M. Bruckman, in Crell’s Journal de Chimie 1799, vol. 11. 
pages 185 to 189, according to the account of iis situation 
in the mine at Chorossan, and according to the analysis of 
Lowitz, thinks that the turquoise is not a petrification of 
the parts of animals, but a particular mineral. 
Lowitz produced from it, by means of analysis, a good 
deal of argil, a little copper and iron; but he found no lime 
nor <a acid *, 
According to Meder, the oriental turquoise is found in 
* LT know not whether the substance analysed by M. Lowitz ought to be 
considered as turquoise, or rather as a particular mineral. 1am inclined to 
think it was the latter, asT always found, in the turquoises J examined, both 
lime and phosphoric acid. ‘er 
1 a primitive 
