NOME XXV. LIME-STONE, WITH OLIVINE. 



1. The soft chrysolite, or asparagus-stone of 

 Werner, is a mere phophate of lime, analysed by 

 Vauquelin. 



2. The chrysolite of the jewellers is a greenish 

 oriental topaz. 



3. The common chrysolite, or peridot of the 

 French, analysed by Vauquelin, contains mag- 

 nesia 50, silex 38, oxyd of iron 9. This is also 

 the chrysolite analysed by Klaproth. 



4. Olivine, called by some volcanic chrysolite, 

 has also been analysed by Klaproth, and though 

 it contained rather more silex and iron, as the 

 proportions will even vary in different specimens 

 of the same identic substance, it must be re- 

 garded as the same with the peridot. There is 

 also found a tincture of lime in olivine, which 

 may proceed from the gangart. These gems 

 are remarkable as alone belonging to the Mag- 

 nesian Domain. 



The jacint of Vesuvius, the Vesuvian of Wer- 

 ner, is also found in the lime-stone of Somma ; 

 and it has been discovered in Siberia, and in the 

 mountains of the Grisons. Melanite has also 

 been found in the calcareous rocks of Somma. 

 But the latter substance is only to be regarded 

 as imbedded in the rock, and strictly belongs to 

 gemmology. 



