DOMAIN I. SIDEROUS. 



tiz a stratum of it has been found over granulay 

 limestone. Voigt Prack. 33. In Lower Silesia 

 it has been found on syenite. 4 Berl. Beob. 

 349. Granite sometimes rests on it. 2 Berg. 

 Jour. 1790, 300. Voigt Mineral. Abhaudl. 25. 

 Hence there can be no doubt of its being a pri- 

 mitive stone. A mountain of it exists in Tran- 

 sylvania; 1 Bergb. 40. Nay, granite has been 

 found in it. 1 Berg. Jour. 1789, 171. It is fre- 

 quently mixed with mica, more rarely with 

 visible quartz : Emmerling*." 



Patrin observed in Siberia many mountains 

 entirely composed of siderite, and containing 

 masses or veins of granite ; while reciprocally 

 the mountains of granite often present veins and 

 masses of siderite f. These accidents are parti- 

 cularly frequent in that part of the Altaian 

 mountains which approaches the river Irtish. 



It also abounds in Bohemia, Saxony, Tyrol, 

 and many other countries, not to mention the 

 isles of Arran, Col, and Tirey; the district be- 

 tween Lochlomond and Dunkeld, and other parts 

 of the Highlands of Scotland ; and also near 

 Holyhead in Wales. 



Saussure describes, 674, a strange mixture 

 of massive granite with a grey heavy rock, which 



* Kirwan Geol. Ess. p. 181. 

 f Min. i. 127. 



