SILICON. 171 



nearly they agree in giving the same atomic 

 weight to this substance. 



1 . TABLE SPAR. 



This mineral, which is a bisilicate of lime, or Table spar 

 a compound of two atoms silica and one atom of 

 lime, occurs in the Bannat. It has been ob- 

 served likewise in Ceylon, constituting a part of 

 the cinnamon stone rock. It has a greyish white 

 colour, and a foliated fracture in one direc- 

 tion only, from which it has got its name. We 

 have four analyses of this mineral ; one by Kla- 

 proth, a second by Strom eyer, a third by Rose, 

 and a fourth by Bonsdorff. 



The specimens analyzed by Klaproth and Stro- 

 meyer were from the Bannat; those by Rose 

 and Bonsdorif were found in Finland. 



According to Klaproth, the constituents of 

 table spar are 



Silica 50 



Lime 45-9* 



Water 5 



100-9t 



The constituents according to Stromeyer, are 



* Klaproth reckons only 45 ; but he obtained 82 of carbonate of lime, 

 which contains 45-9 lime. 

 | Beitrage, III. 289. 



