MODE I. SIDERITE. 



Black siderite from Mount Sinai. Given to the 

 author by Roziere, a skilful mineralogist, who 

 accompanied the French expedition. 



Compact siderite, from the isle of Col, Scot- 

 land. 



The same, from the iron-mines of Sweden. 



The same, of a brownish and grey colour, from 

 Finland. 



Green siderite, from Sweden. 



Saussure mentions, 1824, beautiful beds of 

 black siderite, in one of which an excavation had 

 been made to extract crystal. 



Aspect 2. Mingled. Black siderite, with mi- 

 ca, from Egypt. 



The same, with olivine, from Egypt. 



The same, with gold and silver, or with elec- 

 trum, a natural mixture of these two metals, from 

 Kongsberg in Norway. 



Green siderite, with garnets, from Sweden. 



The same, intermixed with iron ore, from Salz- 

 burg. 



The same, with hard clay, from Vesuvius. 



The same, with pyrites, from Arindal in Nor- 

 way. 



The same, from Salberg in Sweden. 



The same, from the iron-mines of Dognaska, in 

 the Bannat of Hungary. 



