No. 386.] REVIEWS OF RECENT LITERATURE. 177 
phyrites, and augite-diorite-porphyrites (kersantites). The norite- 
porphyrites are all quartzose. Besides these he gives a few notes on 
some granular stock-rocks that are intermediate in composition be- 
tween quartz-diorites and quartz-norites. 
Cathrein points out the fact that the porphyrites have a granular 
groundmass and in other respects are closely allied to granular 
diorites. Among these he mentions the existence of téllites, vint- 
lites, and suldenites. The töllites differ from the tonalite-porphyrites 
in being more basic and in containing a very little quartz but a large 
quantity of garnet. The vintlites contain dihexhedra of quartz as 
phenocrysts in a fine-grained green matrix. The type is not that 
described by Rosenbusch in his “ Physiographie.” The author 
would include all the rocks above described and those of Klausen 
under the name “ Klausenite.”” They vary in composition between 
biotite-hornblende-diorites and corresponding rocks in which ortho- 
rhombic and monoclinic pyroxenes and often some quartz occur. 
The variation in their structure appears to be due to their varying 
composition rather than to their mode of occurrence. From the 
fact that diorites, norites, and gabbros are often found to intergrade, 
he regards them as constituting a great’ family. The Klausenites 
are the quartziferous forms of thése. The author concludes his 
discussion with an argument against the use of different names to 
designate the dike and effusive forms of the porphyrites. He would 
class them together as diorite, norite, and gabbro-porphyrites. 
Three California Rocks. — A peculiar dike rock cutting the 
granodiorite on the ridge between Butte and Plumas Counties, 
California, consists of quartz, plagioclase, and needles of an amphi- 
bole in a granitic aggregate. The amphibole is in largest quantity. 
Turner! reports its composition as follows: 
rg igs frk FeO se NiO CaO BaO MgO K,O Na,O H,O<r10° Pee e 
-64 s3 05 7-74 :05 «111.86 tot 2 
i new EE ae rock is also described by the same author 
from Mariposa County, California, and a quartz-alunite rock from In- 
dian Gulch in the same county. The former is made up of augite and 
amphibole grains, a little quartz, and some pyrrhotite, forming a 
matrix through which are scattered large phenocrysts of brown 
amphibole. The quartz-alunite rock is a metamorphosed clastic. 
An analysis of the alunite separated from it gave: 
SiO, TiO, AlO, FeO; CaO K,O NaO H,O at 100°+ SO, Total 
2.64 4 OF +23 55 4.48 2.78 11.92 38.50 = 99-55 
1 Amer. Journ. Sci, vol. v (1898), p- 421. 
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