TAB. XXXVI. 



CALX carbonata, var. metastatica. 

 Carbonate of Lime, var. metastatic. 



Class 2. Earths. Order 1. Homogeneous. 

 Gen. 1. Lime. Spec. 1. Carbonate of Lime. 

 Div.l. Crystallized. Far. Crystal metastatic. 



1 his specimen shows a variety of faces depending on cer» 

 tain laws of increase and decrease, and seems more regu- 

 larly forming the metastatic within, where it abounds with 

 pyrites, than externally. This serves to show that crystal- 

 lization may continue while one substance has another 

 within it. The pyrites, from their colour, as well as form, 

 should seem to hold copper as well as iron. 



