Elements of Mineralogy. 



SPECIES III. 

 Cupreous Stones. 



Analogous to the calciform ores are the 

 cupreous Hones, Turquoije and Lppis Ar- 

 ineniis. 



17. Turquotfe is the tooth of an animal 

 penetrated with the blue calx of copper ; it 

 lofes its colour when heated ; it is opake, and 

 of a lamellar texture, and fufceptible of a fine 

 polifh ; its fpecific gravity is from 2,5 to 

 2,908 ; fome are of a deep blue, fome of a 

 yrhitifh blue, but become of a deeper when 

 heated. This fton is found in Perfia and 

 Languedoc. The copper may be extracted 

 from it by diftilled vinegar. According to 

 Reauinur, Mem, Par. 1715, nitrous acid will 

 not diffolvethat of Perfia^ though it will that 

 of France* which fhews a difference between 

 them. 



1 8. Lapis Armenus is another blue ftone; 

 which does not admit of any polifh, and con- 

 lifts of calcareous earth, or gypfum pene- 

 trated with the blue calx of copper ; hence it 

 fometimes effervefces witji acids, and fome- 

 times not, but never gives fire with fteel ; \\ 



lofcs its colour when heated. 



i ....... . . ... 



SPECIES IV. 



