161 



in the southern Lrals pyroclilore has been found in syenite and 

 likewise in tlie neighbourhood of Pike's Peak in Colorado. Of 

 late years P. Holmqvist has discovered and described pyro- 

 clilore from the elaeolite - syenite in Alnö near Sundsvall ')• 

 Closely allied to pyrochlore are the minerals microlite and 

 perofskite, of which the former has been found in granitic 

 pegmatite and the latter in contact zones of limestones. In 

 the sodalite-syenite district on the firths of Kangerdluarsuk and 

 Tunugdliarfik in Greenland, which has been known for a long 

 time, neither pyrochlore nor any other mineral related to it has 

 hitherto been found. 



G. Norden ski old discovered in the Liitzen collection 

 from Narsarsuk a mineral which, in spite of the extremely 

 scanty supply of material, he subjected to an investigation 

 with the result that he found it to be microlite'-'). This 

 mineral I also found on Narsarsuk and shall describe it 

 later on. Besides this I found two other minerals, which were 

 at first supposed to be pyrochlore; but on closer investigation 

 it has been found that, instead of pyrochlore, we Ihlve here 

 two new^ minerals related to it. To one of these minerals I 

 have given the name dial с о I am p r i te. 



The name chalcolamprite is derived from the Greek words 

 уалумс,, copper, and Лааттрос, shine, lustre, and has 

 been chosen in allusion to the fact that the faces of the crystals 

 mostly display a copper-like lustre. 



Chalcolamprite has only been met with in the crystal- 

 lized state. The crystals are small; the largest individuals that 

 have been observed measure only 5""° in size. They belong to 

 the cubic system, and the only form that has been observed 

 on them is the octahedron. The crystals are fairly regularly 

 developed with sharp corners and edges and tolerably brilliant 



') Gcol. Foren. Förli. Vol. M, 1S93, p. .'>SS. 

 2) Ibid. Vol. 16, 1894, p. 33G. 



XXIV. 11 



