632 THE VOGT 
individuals of hypersthene show marked idiomorphism against the 
magnetite (and ilmenite), the crystallization of the iron ore seems 
to have begun when only the lesser part of the hypersthene had 
solidified. 
Further we find here and there in the same thin section some 
small crystals of pyrite, surrounded by a thin wreath of magnetite 
(or ‘‘titanomagnetite”). The pyrite accordingly has here served 
as Fixkorper for the deposit of magnetite, which also indicates a 
solidification of the magnetite at a relatively early stage, while 
the essential part of the rock still remained in the liquid phase. 
Fic. 31.—Photomicrograph (30: 1) Fic. 32.—Photomicrograph (45:1) 
From the same thin section of norite from Skougen shown in Figure 13, contain- 
ing 1-2 per cent “titanomagnetite.” Figures 31 and 32 represent two places with 
much magnetite (and ilmenite), besides hypersthene, a little hornblende, and biotite. 
In the olivine-hyperites, rich in olivine, with about 25-30 per 
cent olivine, only 1-2 per cent “‘titanomagnetite,”? much plagio- 
clase (labradorite, quite rich in An), and some diallage, etc.} the 
crystallization, as mentioned above, commenced with the solidi- 
fication of some olivine, and only then did the “‘titanomagnetite”’ 
commence crystallizing as a deposit on the olivine crystals which 
acted as a Fixkdrper. We refer to Figure 33, drawn with the 
detailed help of a photomicrograph. 
We have here treated several gabbros and norites with only 
very little magnetite (and ilmenite). In the corresponding rocks 
