74 Pentti Eskola. 
ig II. ILS 
Si0, 50.63 46.72 51.82 é 
TiOs — tr. — Å 
AT, Olkoue 244 0.60 | 
Fe,03 18.91 17.20 ERE ND 
Fe0O 12.46 10.57 8.14 
VER OVE ER 1.31 1.00 
MygO 4.05 2:57 1.47 
CaO 6.62 13.51 3.01 S 
Na;0 7:33 4.88 11:87 
FOO EE 0.48 0.85 
HSO We så 0.50 
100.00 99.74 100.28 
The errors in the analysis appear here magnified nearly 
twentyfold. A comparison with the analysis of the aegirite- 
augite from nephelite-syenite, Zwart Koppies, Transvaal ?) 
(II) and that of aegirite from nephelite-syenite, Lujaur Urt, 
Kola ?) (III) is sufficient to prove that pyroxenes of such 
a composition may possibly exist. It is evident that we 
have to do with a pyroxene in which the aegirite compound 
plays the dominant part. This is also apparent from the 
optical properties of this pyroxene: It is dark green in 
colour and its pleochroism is somewhat stronger than in any 
of the pyroxenes in the garnet-bearing syenites. The colours 
are : « = pure green, 8 = grass green, y = brownish green. 
There is a marked zonal development, the intensity of the 
colour increasing from the centre towards the margins and 
the angle c:« decreasing at the same time from about 
43” to 20”. The birefringence is also different: a grain being 
orange of the first order has orena zones showing yellow 
of the second order. ”A 
The only accessories of this rock are titanitenm 
euhedral crystals scattered throughout the mass, and ap a- : 
tite forming rounded prisms. 
!) H. Rosenbusch, »Elemente der Gesteinslehre, p. 122. 
2?) W. Ramsay, Fennia, III, N:o 7, p. 41, 1889. 
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