1921. No. 8. ôX THE ECLOGITES OF NORWAY. 



95 



In another work^ Kolderup gives a description ot' the Storenuten 

 labradorite field east of Bergen. Here also garnet-bearing varieties and 

 basic segregations occur. Special attention is given to a segregation from 

 Hagasaeter (p. 159), mainly composed of green clinopyroxene with green 

 hornblende, ore and garnet. In this mass are stained round aggregates of 

 plagioclase with a kernel of a larger garnet crystal or with a boundarv 

 row of small garnet grains. 



Another type from Xordviksaeteren contains numerous irregular grains 

 of garnet embedded in a feldspar mass. 



Hiortdahl and Irgens (op. cit.) designated almost all pyroxene- and garnet- 

 bearing inclusions in the labradorite-rocks as eclogites, while Kolderup made 

 the definition of eclogite more restricted, so as to comprise only somewhat 

 homogeneous segregations in which the pyroxene has the omphacite- 

 character, being clear and free from pigment and without the diallage- 

 parting. He admits, however, that the pyroxene-garnet segregations are 

 transitional on the wav to the formation of eclogite. 



The Author's Observations on Garnet-Iabradorite-rock 

 in the Bergen Region. 



Scapolite-bcariiig Garuct-labradoritc-rock. 



The treatise of Kolderup having been abstracted at some length mv 

 own microscopic observations can be quoted in so much fewer words. 

 I had at my disposition the specimens collected by Th. Hiortdahl and 

 M. Irgens in 1861, and some specimens collected by H. Reusch in 1887, 

 and a collection of C. F. Kolderup, all kept at the Geological Museum in 

 Christiania. Fig. 14 shows the appearance of a garnet-bearing labradorite- 

 rock and a dark inclusion in labradorite-rock from the Bergen-region. 



In the unaltered labradorite-rock the garnet appears with sharp boundary- 

 lines and in euhedral or rounded shapes. I studied such examples from 

 Alvaerstrommen and from Rado. Both these examples happen to contain 

 scapolite-. 



In the specimen from Rado the scapolite occurs perfectly in the 

 manner of a truly primary constituent, with irregular or rounded form, 

 often enclosed in the labradorite. It is a wernerite, having oj — s = 0.025 

 appr., and a réfringence considerably higher than that in the labradorite. 

 Uniaxial and negative character and a tetragonal prismatic cleavage are 

 conclusive diae:nostics. 



' Carl F"red. Kolderup, Fjeldbygningen i stroket mellem Sorfjorden og Samnangcrfjorden 



i Bergensfeltet. Bergens Museums Aarbog 1914. — 15, n:o 8. 

 - According to private information by professor V. M. Goldschmidt scapolite, in the 



labradorite-rocks of western Norway, was first obser\'ed by Professor B. Popoff. 



