MODE III. FELSPAR, 



159 



Such rocks may be said to be always white, like 

 those consisting of felspar alone. 



Felspar rock, with a few garnets, from a moun- 

 tain in the west of Scotland. 



The same, lightly sprinkled with mica, from the 

 Alps. 



The same, with a few grains of quartz, Petuntzc 

 of the Chinese, from Limoges, in France. The 

 fine porcelain of Sevre is composed of this sub- 

 stance, the quartz being carefully separated. The 

 same is also found in Cornwall, Saxony, China, 

 and many other countries. When the felspar is 

 decomposed into a white clay, it is called kaolin, 

 and is also necessary in the fabrication of porcelain. 



The beautiful opalised kind of felspar, called 

 Labrador stone, is also a component part of rocks 

 in Finland and Norway, where it only reflects the 

 blue lustre ; both kinds, when viewed alone, with 

 the beautiful green felspar from Siberia, falsely 

 called the Amazon's stone (which was found near 

 the river of Amazons, in South America, and is a 

 jad), rather belong to gemmology, as they do not 

 constitute entire rocks. But the Labrador and 

 Norwegian rocks, considered as a compound, are 

 here classed in the Anomalous Domain. 



Petuntze. 



Kaolin. 



Labrador, 



Green of 

 Siberia. 



