120 



nation b{0l0], c{00l}, /"{lOl} and m{llo}. The last-men- 

 tioned occurs only occasionally. The crystals are cloudy and of a 

 reddish colour. 



Heulandite. 



This mineral is found only in a few localities in East- 

 Greenland and in rather small quantities. The crystals vary 

 very much being often very differently developed even in speci- 

 mens from the same locality. 



Henry Glacier. Heulandite was found in the medial 

 moraine of the glacier in two, very different forms : 



1) Л brownish-grey dolerite rock was found to contain several 

 cavities, the greater number of which were devoid of zeol- 

 ites, while a tew contained heuland- 

 ite crystals. The length of the cry- 

 stals is 3 — G^^] their form somewhat 

 resembles the pseudo-tetragonal com- 

 plex (represented in fig. 6), which 

 this mineral has also been observed 

 to assume in other localities. Com- 

 bination 6{010}, c{00l}, ^{201}, 



s {201}, m {110}. The faces are generally bright and well- 

 developed, occasionally somewhat curved. The crystals are 

 semi-transparent and of a whitish colour. 



2) Other specimens consist of a breccia-like rock in which 

 fragments of an exceedingly compact basalt 

 are cemented together with zeolites. In 

 only a few places do these take the form 

 of freely-developed crystals. The main mass 

 of zeolites consists of cbabazite, on which 

 are grouped small heulandite crystals (length 

 V2"^™), which are developed as shown in 

 fig. 7. The crystals form plates parallel to 



Fig. 7. Heulandite; ^f^'^^l' *'»^ ^^S^s of wliich are bordered 

 Henry Glacier. ' by c{00l}, ^ {20l}, s{20l} and r {50t}' 



Fig. 6. Heulandite; 

 Henry Glacier. 



