MODE XIV. CALCAREOUS GLUTENITE. 527 



grey and dull white : a striking singularity is, that 

 the large brown spots have sometimes red edges, 

 and an oval or triangular spot of light grey will 

 have a red spot of the same shape in the centre ; 

 so that the very fragments would seem to be of 

 original crystallisation, which has been modified, 

 or rather disturbed, by some violent cause, at a 

 particular period of its progress. This singular 

 marble might, with the English kollanite, form 

 a cabinet of study for the geologist; for the 

 appearance of both is utterly irreconcileable with 

 received opinions. As sand is now allowed to be 

 often a product of original crystallisation, so peb- 

 bles, which are only a larger sand, must in the 

 kollanite, and may in this calcareous rock, be of 

 original formation, and afterwards agglutinated 

 by a resumed progress of the process. 



This singular bricia is at Paris called brlche 

 cVAleppe, as if it came from Aleppo in Syria ; but 

 M. Brongniart informs us that this is a corrup- 

 tion, and that it should be called d'Alet, from a 

 place about a league from Aix ; yet he describes 

 it as red, black, and grey, which must be quite a 

 different sort. Brard, who has treated the French 

 marbles with great care, says, that the bricia 

 sometimes called of Aleppo, and sometimes of 

 Alet, by the marble-cutters of Paris, is the antique 

 violet bricia, which has been already mentioned ; 



