itfS On a Variety of carlonated Lime. 



afpetl is fo peculiar that nothing can prove their identity Ijiit 

 aualvfis and the laws of liru6lure. 



We fliall compare this new variety of the epidote only with 

 the phrenite, becaufe it is under this name that it is defcribed 

 by Sauflure : it diflers from it by its fpecific gravity in the 

 ratio of 33 to 36, and by its ftni6ture, as it exhibits evident 

 fe£tions in two directions, while the phrenite exhibits only 

 one : in a word, it is not ele6lric by heat. 



The rock which accompanies it is compofed of the fub- 

 ftance of the garnet, the epidote itfelf, calcareous flone, and 

 quartz. TheTe elements fometimes are in proporiions nearlv 

 equal; but it happens for the moft part that the matter of 

 the garnet predominates. In fome fpecimens the epidote is 

 .difpofed in thin zones between cryftals of garnet, on which it 

 is moulded : it appears alfo in amorphous mafl'es pretty vo- 

 luminous. Nothing certain can be faid in regard to its pofi- 

 tion j -but it may be affirmed that it is found in the cavities or 

 fiflures of primitive mountains. We do not think that it has 

 ever yet been found in its proper place by arty naturalift; and 

 the cafe is the fame with the other produftions of St. Go- 

 thard. , The dealers in cryftals go in queft of them, and fell 

 them to travellers. 



VIIT. Nots on a Variety of carhonated Lime found near Port 

 Seguin, Department of Vienne. By C. Cress AC, Eiigi- 

 nccr of Klines *. 



i HIS variety, which has not yet been defcribed, refults 

 from a combination of the three following laws of decre- 

 ment : 



ift, That which produces the prifmatic by a decrement of 

 two rows in the inferior angle e (fig. 5. PI. III.) 



2d, That which produces the inverfe by a row on the right 

 and left of the angle E. 



3d, That which produces the equi-axis by a decrement of 

 ■one row on the edge B.' 



The reprefentative fign of this variety, reprefented fig. 6, 



is ^ E E B ; it has been called by C. Haiiy co-ordonaie 



r. 



carbonated lime. This name is deduced from the pofition of 

 the facets produced by the three decrements in queftion. 



* From the Journal lies Mines, No. 67. 



Thefe 



