105 



without leaving any trace; often, however, the needles pierce 

 the other minerals, which is specially beautiful in the clear 

 and transparent ones as albite and catapleiite. Sometimes the 

 needles diminish to almost microscopic dimensions, and then 

 they form a matted, brownish mass, in the exterior very much 

 recalling certain lichens. 



It has not been possible to make a complete chemical 

 analysis, as it has been impossible to procure a sufficient 

 amount of pure material without using up all that existed of 

 the mineral. Determinations made by Mr. Сце. Christensen have 

 shown, however, that the amount of SiO^ and TiO.^ is about 

 as usual, while the amount of Mn is considerably smaller. 

 Also in this respect, as with regard to form, the mineral thus 

 agrees with that friflu Colorado. 



Epididymite. 



Of this mineral only a rather small material has been 

 found; but almost all the material brought home belongs to a 

 type which is not usually found in the mineral, and which I 

 shall here describe. 



The form of the crystals is very much lengthened after 

 the è-axis^) (more than shown by the figure), and besides the 

 crystals are highly flattened after c{00l); thus the crystals, 

 as to form, resemble those described by Funk under the name 

 of type 11; but these latter are much larger and mostly bounded 

 by other surfaces. 



The crystals described here have an average length of 

 1 — 2 cm, the breadth (after the è-axis) is 1 — 3 mm, the thick- 

 ness (after the c-axis) is ^U — 1 mm. The combination is most 

 frequently as shown in fig. 4, viz. w{310}, p{31l}, m{ll0}, 

 c{00l}, (7 {012}, е{023}, d{0\\}, /"{021}, and è{010}, that is 

 to say, only surfaces known before and also otherwise fairly 



1) According IoFlink's arrangement, see: Medd. om Grønl. 24, 1901, p. 62. 

 xxxiii. 8 



