46 f'F.NTTI KSKOLA. M.-N. Kl. 



theless hapfx ned U> coiiipiisc the niosi iin[K>rl;int ;ind sonio of the most 

 extreme chemical types as well. 



A descn'jjtion of the primary structures ( A the eclogite can therefore 

 be given most briefly by referring to the examples subjected to quantita- 

 tive investigatif>ii. 



1. 77u' Rddliaugcii type occurring only in the eclogites forming bands 

 ill the oli\'ine-rocI<. Coarse-grained. Either garnet or pyroxene, or both, 

 show a tendency towards phenocryst-like development. 



2. '///r Ducii typr. Non-ffjliatcd or indistinctly foliated, porphyritic 

 structure with rounded phenocr3'sts of garnet in a fine-grained or medium- 

 grained ground-mass of pyroxene, occasionally with amphibole. The example 

 analyzed was a chloromelanitc-eclogite rich in iron. In both these charac- 

 ters, i. e. the |)(rcentage of jadeite in the clinopyroxene and almandite in 

 the garnet, the eclogites of similar appearance, however, may be greatly 

 variable. 



This type is represented in all the occurrences in Almklovdalen not 

 enclosed in the olivine-rock, but there are many other types as well. Near 

 Duestol and Almklovsaeter the rock is much banded and many bands con- 

 sist of margarite- and labradorite-bearing rocks', transitional into the 

 labradorite-rock. 



' Eclogites of the Duen type are very common as erratic boulders in 

 Almklovdalen and Vanelvsdalen. The most beautiful and t3'pical specimens 

 have been collected from these. This only proves that there are many 

 occurrences so far not yet found exposed, hi fact, at every little trip on 

 the mountains near Almklovdalen I found several occurrences of eclogite 

 not recorded formerly. 



The same type also is represented in the specimens from almost all 

 the occurrences in Nordfjord and More so far known. 



In the old specimens marked "Duen, Vanelvsdalen" the garnet shows 

 a zonal structure. The central parts are more dark red in colour and 

 have notably higher réfringence, thus being richer in iron than the border- 

 zones. 



3. The Lyngenes type. Extremely foliated, hne- and even-grained. 

 The pyroxene, with amphibole, is present in the form of long prisms and 

 the garnet as small grains arranged in rows parallel to the foliation. Often 

 very distinctly banded, with alternating laminae rich in pyroxene and 

 garnet respectively. 



Specimens of the same type as the analyzed rock from Lyngenes 

 near Sorpol in Selje have been collected from Langeland near Hellesylt, 

 Sunelven and from Ullahammer on the island Haram. I found similar 



' Margarite as a constituent of eclogites was first observed by me in a specimen from 

 Hellebust in Almklovdalen, collected b}^ Prof. C. F. Kolderup and kept in Bergens 

 Museum. 



