Meddelelser fra Kristiania Universitets Mineralogiske Institut. 



No. 1. 



Notes on Norwegian Minerals 1—6. 



By 

 P. Schei. 



(With one plate.) 



1. Fergusonite from Hegtveit, Evje, Sætersdalen. 



X his mineral has been found for the first time in this 

 country in the feldspar quarries in the neighbourhood of Arendal 

 and has been described by Forbes and Dahll by the name of 

 tyrite. Later, it has been found in a number of places in southern 

 Norway. So the present writer found it, in 1908, at the Heg- 

 tveit feldspar quarry in Evje, occurring in abundance at a par- 

 ticular spot near the western boundary of the pegmatite mass. 

 The wedgelike interstices of a rosette of great biotite flakes were 

 filled, mainly, with oligoclase and microcline, also some quartz 

 and pyrite at the inmost edges. In the mica or immediately on 

 that mineral were observed crystals of xenotime and cyrtolite. 

 Arranged in a band 10 — 15 centimeter broad, along the edge 

 of the fillings, crystals of fergusonite were seen protruding from 

 a little below the surface of the mica for 2 — 7 centimeters into 

 the feldspar. 



The mineral is looking, very fresh, with a splendent black 

 colour, subconchoidal fracture and a brownish red transparency 

 in thin splinters. The specific gravity has, occasionally, been 



