642 FEES VOCE 
norite, may contain in solution only quite a small quantity of FeS 
(and still less of Cu.S and NiS). Melted sulphide, consisting 
of FeS, etc., may, at the temperatures mentioned, dissolve only a 
trifle silicate.t The pyrrhotite-rich rocks mentioned must therefore 
during the interval of crystallization have consisted of two liquids 
(two liquid phases), one silicate phase with only a little dissolved 
sulphide and one sulphide phase without or with only a very incon- 
siderable amount of dissolved silicate. 
Fic. 44.—Photomicrograph between Fic. 45.—Drawing (8:1) 
crossed nicols (15:1). 
Pyrrhotite-norite from Dyrhaug, Skjakerdalen, Verdalen, Norway (cf. Figs. 20 
and 21). Porphyritic labradorite in nickel-pyrrhotite, besides a little. hypersthene, 
diallage, and biotite. 
The common norites and gabbros usually contain o.1-0.4 per 
cent S, which corresponds to about o.25-1 per cent pyrrhotite, 
which, however, occasionally is accompanied by some pyrites. 
The pyrrhotite is here usually not evenly distributed in quite small 
individuals over the whole rock, but most often accumulated in 
somewhat larger lumps with a diameter of 0.5, 1, or 2mm., occa- 
sionally more (see, for instance, Fig. 10). 
Against the pyrrhotite the hypersthene as well as the diallage 
and labradorite here also appear with idiomorphic outlines. As an 
example we refer to Figures 12 and 21 and to Figure 46 from a 
t See “‘Sulfid: Silikatschmelzlésungen,” I (r919). 
