10 



When we use the term Calx carbonata, it means crystal- 

 lized carbonate of lime. 



The lower figure is from the summit of Moel y hiraddwg, 

 a lofty hill bounding the vale of Clyde, and was sent me by 

 D. Pennant, Esq. F.R. S. F. L. S. with some nearly like the 

 above. This is a specimen of a more confused crystallization, 

 the red oxid being very abundant. The crystallized parts are 

 separated in irregular columns of a romantic appearance : the 

 little white strata at the bottom have settled between the red 

 ones in a curious manner. The fracture is irregular, de- 

 pending on the confused lamina, the light falling on the flat 

 sides of which occasions a shining lustre. 



