432 SAE VOGH 
between analyses Nos. 46-48 prove that the orbicular rock, Nos. 
46 and 47, is only a facies near the boundary of the ony quartz- 
norite (No. 48). 
The mineralogical composition of the orbs (with some biotite 
in the exterior part) of the intervening mass (by Bugge), and of 
the entire quartz-norite (from my own calculation) are as follows: 
Orb Intervening Total Quartz- 
ass Norite 
Hypersthene snes sayasenon cee ane 92.0 ° 63.0 
Biotite, s....5:2. eee Ae ee TB 10.0 8.0 
Plasioclase.23 cas tare: tana sea ae arenes tr. 1B 05 23.8 
16 1 OE) oy Aner reer trocar nat MERI ern one eallicen ciate -c Bua a aa I5.0 4.0 
Raat is 2.2 Ayan Oe ah eee rn 0.55 0.39 0.5 
Apatité..../ .2tkasvednaaacemae cree 0. 23 1.18 0.9 
Total: iste See eee ee eee 100.0 100.0 100.0 
In addition there sometimes appear in the intervening mass small 
individuals of garnet, exceptionally also of pyrrhotite (‘nickel 
pyrrhotite’) in very small quantity. 
The plagioclase of the intervening mass, which on the average 
may be placed at 47 Ab:3 Or:50 An, therefore almost exactly 
Ab,An, varies between Ab,,An;s (with a little Or, analysis No. 43a, 
with extinction 7°rs5’ on oor according to Bugge) in the kernel of 
the individuals and Ab,;An,, (analysis No. 43c, with extinction 
3°30’) in the exterior zone. Locally the plagioclase contains still 
more Ab, according to Bugge with extinction on oor of 1°15’, corre- 
sponding to about Abs.An;s (in both cases with a little Or). Con- 
cerning this matter we refer to some remarks in a following chapter. 
Naturally the orbs are first formed, and only later the inter- 
vening mass solidified. Near the center of the orbs, the hypersthene 
individuals are to a great extent radially arranged. In the exterior 
part of the orbs‘ we find, on the other hand, an indication of con- 
centric structure (see Fig. 8). 
If we leave apatite and rutile out of consideration, we may 
distinguish between the following stages of crystallization (Fig. 9): 
* Some inclusions of the material of the intervening mass also appear here and 
there in the orbs (cf. p. 320). 
