143 



TAB. CLXXV. 



CALX carbonata; var. inversa. 

 Inverted Carbonate of Lime. 



Div. 2. Crystallized ; var. inverted rhomb. 



*V here there is much Carbonate of Lime, as at Portland 

 Island, there may be expected much variety. Thus there 

 are some varieties of that sort used for building, see lab. 8 ; 

 and also some of the crystallized, see tab. 143, 144. As 

 well as tab. 174, the present specimen is rather a whim- 

 sical one, showing how nature sports, yet conformable to 

 a certain regularity. 



The last aggregation of molecules had apparently formed 

 nuclei of inverted rhombs, arranging themselves something 

 like an inverted pyramid — see left hand figure, tab. 174. 

 The present specimen has a great variety of three-sided 

 pyramids, nearly regular, or with prominent sides, (see the 

 left hand loiver figure,) and consequently concave faces, 

 (see the right hand figure,) and with various kinds of 

 bases, as in the other separate figures. 



