60 | Pentti Eskola. 
Many specimens undoubtedly contain pyroxenes much richer 
in the aegirite compound. As will be shown on later pages 
there are related granitic rocks softalming pyroxene in which — 
the aegirite dominates. AT 
It may be useful to set forth a comparison between this 
pyroxene and such from igneous rocks as well as from skarns. 
We take only a few analyses, as the relations are in this case SR 
perfectly clear and well understood. Under I is quoted the 
analysis of the pyroxene from the sviatonossite once more, 
under II that of augite from tinguaite, Two Buttes, Colo ?), 
and under III the analysis of aegirite-augite from leucito- = — 
phyre, Burgberg near Rieden ?). These are all pyroxenes 
from igneous rocks, quoted formerly by the authors of the 
quantitative classification (table XIT). The following are 
analyses of skarn-pyroxenes, namely, IV, pyroxene from 
Grua, Christiania Region, Norway, analyst M. Dittrich 27) 
and V diopside-hedenbergite from Nordmarken, Sweden, 
analyst C. Doelter 2). 
I II BÖR IV VÄN 
STO, FEA8:30 ÄT DAS SE AGA 52.11 50.91 
TiO; 0.78 3.00 0.73 2 SA 
Al,O; 4.96 4.14 4.28 0.28 0:17: VR 
Fes0, > 5.98 5.64 5.95 ALS 0.76 
PeO 1264 SSA ORN  LAL 8.05 17.34 
Mini” se Fr ENE RÖRS GESNA E. 2.05 0.21 
Mgy0O = 1564 2 10:05 DA 11.26 7.21 
CaO 19.60 Tod 19.23 SSU 22.030 
Na, 0505-196 1.38 KG: 0.50 - = 
K.0 0.06 0.12 0.74 0.20 — 
H,0 = — 0.27 fr 
100.69 100.21 99.42 100.00 5) >--99.53 = 
2) Bull. 168 U. S. Geol. Surv. p. 165. 
2) H. Rosenbusch. El. Gest. p. 278 (1901). 
3?) V. M. Goldschmidt, Die Kontaktmetamorphose im Kristianiagebiet, 
p. 348. ; 
2? C. Doelter, »Ueber Diopside») T. M. P. M. 1878, pp. 49—70, quoted 
in Aeksen f. Kryst. IV, p. 90. 
5) Calculated to 100 percent of carbonate-free substance. 
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