NOME I. D. BASALTIN. 35 



NOME I. DECOMPOSED BASALTIN. 



The German mineralogists have not been de- 

 ficient in their observation of this curious ap- 

 pearance. Karsten, in his catalogue of Leske's 

 collection, has the following instances, among 

 others, in the geographical series. 



HYPONOME I. 



Basaltin. 



" 1525. Very fine splintery basalt, with half of Germany, 

 decayed chrysolite disseminated, and exteriorly 

 decomposed to yellowish brown clay, from Riet- 

 stein, Saxony. 



" 1533. Basalt, in which the chrysolite is be- 

 come very steatitical through decay, from the 

 same place. 



" 1534. Apiece of basalt with decayed chryso- 

 lite, wherein it is quite evident that the pores ori- 

 ginate from the decay of the latter, from the same 

 place. 



" 1577. A piece of basalt, mixed partly with 

 small grained chrysolite, partly with felspar, which, 

 as is very frequently the case in granite, is decom- 

 posed to lithomarga; from Wachberg, beside 

 Hartmansdorf. 



