I92I. No. 8. ox THE ECLOGITES OF NORWAY. 49 



bole then began to crystallize and, at the same time, resorption of the 

 pyroxene and, though in smaller degree, of garnet set in. 



The amphibole-eclogite difters from the eclogite-gabbro of the Roms- 

 dalshorn type as well as from partly amphibolitized eclogites in the absence 

 of plagioclase, and in the tremolitic character of the amphibole. Therefore, 

 if the amphibole-eclogite actually originated by magmatic resorption and re- 

 crystallization in the manner just outlined, we must assume that the amphi- 

 bole was formed mainly at the expense of pyroxenes, diopside and ensta- 

 tite, while the garnet remained more intact. This conforms to the actual 

 structures, the large size and sometimes euhedral development of the garnet, 

 and the poor development of the green kelyphite zones. 



Thus this coarse-grained amphibole-eclogite presents itself as a kind 

 of eclogite-pegmatite, and is probably related to the following type of 

 pegmatitic development in the true eclogite facies. 



8. Eclogitc-pcgiiiatifc of the Grytiiig type. At Grvtingxaag near the 

 church of Selje I met with a lens of extremely coarse-grained eclogite- 

 pegmatite (fig. 4>. But small remains of it have been preserved in the original 

 form, and the main part has been amphibolitized in such a way that the 

 primary forms and structures ha\-e been preserved in the finest details as 

 pseudomorphs. 



The unaltered rock is mainly composed of enstatite, diopside and 

 garnet. The enstatite and garnet may be found as crystals up to 5 centi- 

 meters in diameter or more; the diopside is somewhat finer in grain. 

 Certain schliers of the rock still contain much coarsely crystalline carbonate 

 and pale brown mica in large scales ; in such portions also occur large 

 prisms of pale green tremolitic amphibole. 



The diopside is light emerald-green ; 



'p = 1.680 ± 0.002. 



In the enstatite which is pale brown in colour were determined: 

 ,3 ^ 1.670 ± 0.002; Y ^^ ^-^15 — 0-002. 



The garnet is brownish red; 



n > 1.74. 



On the one side of this eclogite-pegmatite, in the same lens, occurs 

 an ordinary fine-grained eclogite of the Duen type. It is ver}- rich in 

 pyrites and has a dark green pyroxene (chloromelanite?). 



By amphibolitization the enstatite at first has been converted into an 

 asbestus-like anthophyllite. At a later stage the diopside has been uralitized 

 and the garnet pseudomorphosed into dark amphibolitic nodules in which 

 the minerals can not be distinguished by the naked eye. 



This inclusion seems to have been detached from some larger body 

 of eclogite intersected bv primary pegmatitic dikes, one of which, together 

 with a portion of its country-rock, has been enclosed in the gneiss. 



Vid.-Selsk. Skr. I. M.-X. Kl. içei. No. 8. 4 



