113 



TAB. CLIX. 



CALX Carbonata. 

 Crystallized Carbonate of Lime. 



Class 2. Earths. Order 1. Homogeneous. 

 Gen. 3. Lime. Spec. 5. Carbonate of Lime. 



1 his curious specimen is from Wanlockhead in Scotland. 

 Besides the whole group being formed like a cone, the in- 

 dividuals are a curious crystallization with a three-sided 

 column somewhat rounding and truncated at the apex, and 

 a central depression. The sides of the column are again 

 divided into four facets, better understood by the figure 

 than by description. The apex is formed of a six-sided 

 facet. 



We thought it somewhat resembled the hard Carbonate 

 of Lime ; but the fracture and its softness give evident 

 proofs of the contrary. We do not know that this modi- 

 fication is to be found in any cabinet but in that of 

 Mr. Laing, which contains the specimen here figured. It 

 is formed as it were from the edges of the nucleus or pri- 

 mitive rhomb, with the obtuse angle upwards ; the laminae 

 decrease less than in the metastatic, and consequently form 

 a longer pyramid, which, as it is inclined to be round- 

 ing, cannot be measured. The truncations nearly on the 



