148 



HIKES OF SARDINIA* 



Others contain but one, two, or three ounces, But tlffi 

 most celebrated of all is in the district of Tulana, which is 

 said to yield seventy per cent of pure silver. This belongs 

 to several private persons, who work it in secret. 

 Copper mines. Copper mines are tolerably abundant in Sardinia. The 

 copper is generally in the form of pyrites. In the district 

 of Sinia are very beautiful malachites. 



Sardinia contains a large quantity of mines of excellent 

 iron: but the most considerable is that of Arsaha, which 

 contains a magnetic iron of superior quality. There is 

 another mine of magnetic iron in a mountain of porphyry 

 at Trulada. 



Lead mines abound in Sardinia, and all contain some pof« 

 tion of silver. The most considerable is that of Monteponi 

 near Iglesias. It yields 6o or 6'4 per cent of pure metal. 

 The lead mines of Sarabus are not less interesting. 



Blende or sulphuretof zinc, occurs mixed with galena. 



On repairing the buildings of a convent at Oristono, na* 

 live mercury was found in a bed of clay. Some persons say- 

 too, that native mercury was found on repairing the public 

 prisons. Chaptal speaks of some having been found in a 

 bed of clay on digging for the foundation of some buildings 

 at Montpellier. 



There are a nura]>er of mines of antimony at Balland, 

 and at Escala Plana. 



A mine of manganese has been discovered at San Pietro. 



Coal has been found at Tanara near Forni, and at Cor- 

 Tuboi. 



Iron, 



Lead* 



Zinc. 



Nat'iT* quick. 

 TiilTer. 



Antimony. 



Manganese, 

 Coal. 



Pyroxene 



de$crib««). 



xr. 



Analysis of various Minerals, hy Mr, Klaproth*, 

 Black crystallized augHe o/Frascatit 



vJ'NE of the principal varieties of augite is that found in 



fine black crystals in fissures in the Latian mountains, near 



Rome, particularly near Frascati, and formerly called 



black volcanic scboerl. 



Its figure is commonly a hexaedral prism, bevelled at the 



extremities, the two faces of the bevel answering to the two 



* Abridged from the Annales de Chimie, vol, LX VII, p. 225, &c. 

 Trans, from Gehlen's Jo«rnal, 



lateral 



