15 



TAB. CIX. 



BARYTES carbonata. 

 Crystallized Carbonate of Barytes. 



Class 2. Earths. Order 1. Homogeneous. 

 Gen. 6. Barytes. Spec. 2. Carbonata. 



I am indebted to the munificence of F. Hall, Esq., for 

 some superb specimens of Carbonate and Sulphate of 

 Barytes. Among them was the present specimen of Car- 

 bonate of Barytes ; and as it is the first time that it has 

 been noticed with elongated spiculas so distinctly seen in 

 hexaedral pyramids, I am pleased at the opportunity of 

 exhibiting a figure of them. They are on a gangue of 

 Galsena or Sulphuret of Lead, forming an irregular sphere, 

 echinated as it were with these spiculse : see the tipper 

 figure. 



The loiver figure on the right hand is a group of the spi- 

 culated crystals : on the left hand is a geometrical outline di- 

 stinguishing the facets, three of which are continued to the 

 apex, alternating with three which do not reach so high : 

 sometimes these last are scarcely to be seen, and the spiculse 

 seem to have only three sides. 



It is from Arkendale, near Richmond, Yorkshire. 



