ENDOGENOUS OR ERUPTED ROCKS. 241 



Hi/per sthene rock is a granular mixture of labrador 

 feldspar, and hypersthene. 



Euphotide and serpentine/ containing sometimes in- 

 stead of diallage crystals of augite and uralite, and thus 

 becoming nearly allied to a more abundant, and, I might 

 almost say, a more active eruptive rock, viz. augitic 

 porphyry. ( 256 ) 



Malaphyre, and the porphyries containing crystals of 

 augite, uralite, and oligoklas ; to which latter species the 

 celebrated verd-autique belongs. 



Basalt, with oliviue and other constituents which 

 gelatinise with acids, phonolite, porphyry-slate, trachyte, 

 and dolerite : the first of these rocks is partially, and the 

 second always, divided into tabular laminee, which gives 

 to them an appearance of stratification, even when cover- 

 ing a large extent. Mesotype and nepheline form, accord- 

 ing to Girard, an important part in the composition and 

 internal texture of basalts. Nepheline forming a con- 

 stituent of basalt remind j the geologist of the miascite 

 of the Ilmen mountains in the Ural ( 257 ), a mineral 

 which has been confounded with granite, and which 

 sometimes contains zircon; it also reminds him of the 

 pyroxenic nepheline discovered by Gumprecht near Lobau 

 and Chemnitz. 



To the second or sedimentary class of rocks belongs the 

 greater part of the formations comprehended under the old 

 systematic but incorrect denomination of floetz rocks, or of 

 transition, secondary, and tertiary formations. If earth- 

 quakes and erupted rocks had not exerted an unheaving and 

 disturbing influence on the sedimentary formations, the 



