COLLECTION OF MINERALS. 279 



continuation of the geometrical forms of carbo- 

 nate of lime. In the second, above the stage, we 

 remark a beautiful crystal of the variety called 

 continue ; and in the third, below the same stage, 

 a superb specimen of the soustractive variety, 

 given by M. Heuland. 



In the fourth case is a series of irregular bodies j 

 amongst which is the fibrous carbonate of lime, 

 presenting the undulating reflections of watered 

 silk, and is hence called satin-spar. It is used in 

 jewellery. 



The lamellated variety, more generally known 

 by the name of Parian marble , employed by an- 

 cient sculptors for the representations of illus- 

 trious personages. 



The saccharoidal carbonate of lime, so called 

 from its resemblance to sugar; it is the marble 

 now employed by statuaries, and comes from the 

 famous quarry of Carrara, in Italy. 



The coarse carbonate of lime, or building stone 

 of Paris. 



The variety called Uais, or very hard free- 

 stone, only employed for ornamental building 

 and sculpture. 



The earthy carbonate of lime, or the substance 

 commonly called chalk, from which is formed 

 the whitening used in house-painting and gla- 

 ziers' work. 



