|i''4j, ' "^^'^^ OF DISKO ISLAND. 269 



It is nearly impossible to render this coal available, as" 

 scarcely any shelter is to be found all along the Waygat, for 

 vessels of any description, while a tempest almost continually 

 prevails in the Strait. It is the same case with the coal of 

 Hare Island, generally known on account of the grains of Am- 

 ber which it contains. There it occurs under an argillaceous 

 wacke, in the following order : 



Coarse conglomerate. 

 vS? ' Argillaceous wacke. 



f. ;^ Brown coal, with amber. 



Fine-grained conglomerate. 

 Sand. 



I have now only to mention the Simple Minerals which ac- 

 company the floetz-trap formation of this country, of which 

 the different members of the family of zeolite, its usual com- 

 panion in all quarters of the globe, are the most remarkable. 



1. Mesotype. — The most common subspecies of this mineral 

 is the fibrous and radiated. The last is found crystal- 

 lised in rectangular prisms, truncated, with pyramids of 

 four planes *. 



b. Ca- 



* Dr Brewster has examined the Greenland Mesotype, and has found it to 

 be an entirely different mineral from the Auvergne Mesotype. In its crystalline 

 form it resembles the Auvergne specimens, while, in its optical properties, it re- 

 sembles the Iceland Mesotypes. It is very remarkable, that the capillary crystals 



■* from Sergvarsoit, have been found by Dr Bkewster to be different from the 



. . targe crystals, and to be the same as those from Auvergne. 



