MODE I. MARBLE. 385 



finest white Carrara marble he has seen blackish 

 spots and veins, produced by a multitude of very 

 small crystals of octaedral iron, affecting the 

 magnet, exactly like those which are found in 

 the ollites of Corsica. 



" Ramorid, in the interesting description which 

 he gives of the peak of Eres-Lids, near Barege, 

 says, that on the summit of that mountain cal- 

 careous beds are observed, which constitute a 

 greenish-white primitive marble, entirely sprin- 

 kled with small duodecagon garnets, round, 

 opake, of the size of the head of a pin. Another 

 variety presents garnet in large irregular crys- 

 tals. These beds of marble alternate with beds 

 of rocks which are indubitably primitive. 



" I have already observed, that calcareous bri- 

 cias are nothing .else than the primitive marbles 

 themselves, the beds of which have been over- 

 turned, while they were still in a soft state."* 



It is equally probable that the calcareous and 

 argillaceous rocks may, in a soft state, have sub- 

 sided from the granite, which had previously 

 crystallised in arrects of great steepness. 



The subject of marbles is almost infinite, as no Arrangement, 

 mineral substance affords such innumerable di- 

 versities, or has so much attracted the attention 

 - 



* Patrin, ii. 304. 

 VOL. I. 2 C 



