REDDISH TOURMALIN. l^^ 



this stone was not a lepidolite ; and it was then classed with 

 the schoerlaceous beryl, or stangenstein. Mr. Hauy placed 

 it with the red scKoerl of Siberia, or siberite, with much 

 more reason, as will appear by the following analysis : and 

 he even classed it among the tourmalins, because its crys- 

 tals have the property of attracting and repelling light sub- 

 stances, when they are heated. As it is not fusible like the 

 tourmalin however, he distinguished it by the epithet 

 apyrous. 



The specific gravity of the crystals detached from the Spec. grav. 

 quartz varies, according as they are more or less old, from 

 2-96 to 3-02. 



Its component parts are 



Silex • • 43*5 Component 



Alumine • • •• 42-25 P"""''' 



Oxide of Manganese ••••1*5 



Lime 0-1 



Soda 9 



Water 1 '25 



97-6 

 Loss 2*4 



100 



'The component parts of this stone therefore, and their Rubellite 

 proportions, completely justify Mr. Haiiy, even in a chemi- tourmaline, 

 cal view, for classing it with the siberite, or apyrous tour- 

 malin; since, from a recent analysis of the latter by MrJ 

 Vauquelin, it is composed of 



Silex 42 Component 



Alumine 40 P*^** 



Oxide of manganese, a little 



ferruginous, 7 



Soda 10 



Loss • I 



100. 

 /To be continued. J 



XIIL 



