Tg2I.Xo. 8. ox THE ECLOGITES OF NORWAY. 89 



99.79 100.26 99.28 



The garnet occurs as rounded crystals. I separated a sample of it 

 with Clerici's solution, and a chemical analysis of the garnet was executed 

 bv Mr. L. Thomassen with the following- result. 



RO : R.3O., : SiO., = 2.56 : I : 2.70 

 Composition: (P>_-._,MnjMg.5.jCai4l.5(Al„,F\>,i.j. 



We find the garnet to be much richer in iron in proportion to 

 magnesia than are the other mafic constituents, the ratio MgO : FeO being, 

 in the garnet, i : 0.63 while in the rock it is i : 0.89. Thus the pyroxene 

 must be poor in iron. 



