MODE V. LIME-SLATE. 



MODE V. LIME-SLATE. 



The marbles, konites, limestones, and alabas- Distinction, 

 trites, are so important in many points of view, 

 that though this kind chiefly differ in the struc- 

 ture from limestone, it was thought advisable to 

 give it a distinct division, especially as the mode 

 of combination is really different, for, not to men- 

 tion the micaceous kind, it is more abundant irj 

 argil than the massive limestone. Lime-slate is 

 the calcareusfissilis of Wallerius; but the foliated 

 limestone of Werner is so called only from the 

 fracture. 



Lime-slate sometimes presents alternate layers 

 of different colours; such as white and reddish, 

 and white and greenish; both of which are 

 found at Dannemora, in Sweden. It sometimes 

 alternates with keralite or chert, sometimes with 

 clay-slate, sometimes with marl-slate. Some 

 singular marbles, of which the veins are quite 

 detached, a,nd uniform, probably belong to this 

 division. The cipolin also sometimes, though 

 rarely, appears in level layers, divided by foli- 

 aceous mica*. 



* The whole isle of Garbolach, Hebudes, is said to be composed 

 f lime-slate, or what is called marllejlag. 



2 H 2 



