DOMAIN IX. ANOMALOUS. 



mose nature, being inlaid, so to speak, with 

 precious substances; such as opaline fel- 

 spar, lazulite, chrysolite, and topaz. 



Those rocks may also be regarded as 

 anomalous which are of very rare occur- 

 rence, and form, as it were, another class 

 of anomalies from the usual laws and order 

 of nature. Among the latter may be men- 

 tioned the hills of rock salt which occur in 

 Spain and Africa; and the hills of iron, 

 intermixed with quartz, to be found in 

 Sweden and Lapland. The few rocks in 

 which barytes is incorporated may also be 

 annexed to this Domain, with Bituminous 

 and Sulphuric Rocks, which are far from 

 common. 



The mineral kingdom, as already men- 

 tioned, is here regarded as divided into only 

 three provinces, Petralogy, Lithology, and 

 Metallogy: the class of Salts and Com- 

 bustibles being divided between the two 

 former provinces. In fact, the term rock 

 salt indicates the province of the only salt 

 which can properly and strictly be regarded 

 as a mineral; the others being found in 



