224 
Analyses of comendites. 
24 A 
SiO sepa Mira 73.68 7476 
TiO RE "57 trace 
EOS a. DY | = 
AIO esate a. 11:05 | 11°60 
р Е 3:98 | 3-50 
Ре u... 1-45 als) 
MnO er on trace — 
МЕ. попе "18 
Ga OF ease! TE "48 "07 
Na Ores Beer 5°20 4°35 
KOT EE | 4'05 4°92 
H,O above 110°. . ‘08 | -64 
На. | ] 
(ORE aed За Ae | — 
РО ое none | trace 
Total... | 10090 | 100-21 
Sp.gr.... | 2'694 
24. Quartz-porphyry (comendite), Ilimausak, South Greenland. 
С. Winter, analyst. 
A. Comendite, Comende, San Pietro Island, Sardinia. M. Dırr- 
Rice, analyst (H. Rosensusca, Elemente der Gesteinslehre, 1898, 
P#257). 
varying from a very dark greenish blue (a and b) to a pale yel- 
lowish green (c). A few of the needles are partly converted into 
black iron oxide. This arfvedsonitic felt is imbedded in a very 
microcrystalline aggregate of felspar and quartz which seems to 
have been produced by divitrification as the boundaries between 
the quartz grains and the felspar grains take an irregular course 
