1 92 I. No. 8. ox THE ECLOGITES OF NORWAY. 21 



grain. On Skjaelhainmeren and in S un dalen a variety occurs con- 

 taining large translucent crystals of olivine, first described by Reusch 

 (loc. cit. 1877). Brogger regards these crystals as phenocrysts and compares 

 them with the phenocr\sts of labradorite sometimes found in porphyritic 

 labradorite-rock. Bregger has made an analysis of such a nodule which is 

 quoted below 1. Under II is quoted an analysis of the olivine-rock from 

 Almklovdalen, published by U. Grubenmann '. 



The rock is markedly schistose, in part due to a stretching out of the 

 grains of olivine and in part to flakes of pale green chlorite and 

 occasionally a colourless mica present in small amounts and arranged 

 parallel. Another mineral very frequently present, either together with 

 enstatite or alone, is a colourless monoclinic amphibole. Bregger regards 

 it as smaragdite, but to me it seems more probable that it is cumming- 

 tonite. I found, in a specimen marked "Almklovdalen": c: y^ 18', 

 2\' Y = 75 " appr. The positive optical character conforms with the cum- 

 mingtonite, while the tremolite-actinolite is optically negative. The percentage 

 of lime in the olivine-rock anahzed is far too low to allow the assumption 

 that lime-amphibole should have formed. Still the rock invariably- contains 

 c h r o m i t e. 



Oli vin e-ensta ti te-rock or saxonite. The olivine-rock in Alm- 

 klovdalen frequently contains some enstatite which in places becomes a 

 chief constituent and ma}- be more abundant than the olivine itself. Such 

 olivine-enstatite-rock or saxonite seems to be confined to the marginal parts 

 of the occurrences and is especially common in the smaller isolated masses 

 around the large lenses. I collected specimens of it from Gaateranden 

 and So r tegelen near Kasen and from two small occurrences west and 

 south o{ Duestol. At the last-named localitv the rock grades over into 



' U. Grubenmann, Die Kristallinen Schiefer, rgio, p. 224. 



