112 



faces cannot be determined because they are so very small. 

 The colour is brownish or greyish. In addition to thom- 

 sonite, only a few chabazite crystals were found in these 

 cavities. 

 2) Other blocks consist of a reddish grey basalt, in the cavi- 

 ties of which about equal quantities of chabazite and thom- 

 sonite crystals are seen. The thomsonite here has the form 

 of small regular spheres (about l"^^ diameter) from the 

 surfaces of which numerous crystals project. The form of 

 these crystals cannot be definitely determined ; the colour is 

 brownish. 



Natrolite. 



This mineral has only been found in a few places and in 

 rather small quantities. The crystals are always small and very 

 badly developed. 



Mount Henry. Natrolite was found here [in radiating 

 masses of 2 — 3 cm. without any surrounding rock and unac- 

 companied by other zeolites. In one cavity needle-shaped 

 crystals were found, projecting freely. These were all much 

 decomposed and had no determinable faces. 



Turner Ö. Radiating masses of natrolite were found in 

 cavities here, associated with stiibite. Freely-projecting crystals 

 are also occasionally found, similar to those mentioned above, 

 being also decomposed and without determinable faces. In some 

 of the cavities free calcite was also found. 



Кар Brewster. A few radiating masses of natroUte were 

 found in a cavity which was almost filled with stiibite. The 

 masses measured about 1 dm. 



Mesolite. 



Mesolite was only found in two locahties. 

 Turner Ö. A small detached fragment was found, con- 

 sisting of a crust of about З"""* thickness. The mineral was 



