■2'3 



TAB. CCCXVI. 



CALX carbonata, var 

 Carbonate of Lime. 



Div. 1. Crystallized. 

 Syn. Chaux carb, analogique. Haiti/, 2. 252. 



Common things are often esteemed by common persons 

 because they look brilliant, and Quartz and Mundic have 

 been thus vulgarly called Diamonds ; and Diamonds in 

 themselves of real value, in rude fragments, without a 

 proper knowledge, might be cast away as rubbish. It is 

 so lately that the instructive lessons of Nature have been 

 consulted on the useful and elegant study of Mineralogy, 

 that those who have taken advantage of this growing know- 

 ledge only know the benefit of it ; they can appreciate 

 what is to be esteemed valuable; they enjoy that eminence 

 that sanctions a due value on what is most explanatory of 

 true science. 



The present specimen is very rare and valuable ; it shows 

 that the attraction that brings two crystals regularly together 

 is confined to one particular side, and not disposed around 

 the apex of the nucleus, as in the common Mackles ; and 

 it is new, as it is connected with the columnar modification ; 

 for we do not know that the columnar crystals of Car- 

 bonate of Lime have been mentioned as mackled in any 

 publication before, except the Count de Bournon's ela- 

 borate Treatise, plate 24, fig. 388. 



Mr. Hewlandj who possesses this crystal, sets an addi- 



