it 



270 ON THE MINERALOGY V 



6. Capillary. Near Sergvarsoit in Disko, there is a j 

 small cave covered with capillary mesotype, which 

 the Greenlanders consider as the hair of one of 

 their magicians called Angekok. When this va- 

 riety is decomposed, it forms the earthy or mealy 



zeolite. 



± Stilbite, — in thin hexagonal tables. 



b. In quadrangular prisms, acuminated by truncated py- 

 ramids. 



3. Chabasie, — crystallised in the primitive rhomb. 



b. In truncated rhombs. 



c. In macles. 



4. Analcime, — crystallised in the form of the leucite. 



5. Compact Zeolite, white and red. — This mineral occurs in 



cavities and veins in all the rocks of the flcetz-trap for- 

 mation , except the basalt-tuff. 



6. Apophyllite or Ichthyophthalme, occurs, 



a. In prisms perfectly rectangular. 



b. Also with the solid angles replaced. This variety 

 was mistaken for mesotype, and described as Meso- 

 type epointe. 



c. By a curious arrangement of the particles, the crystals 

 of apophyllite are sometimes cylindrical, and being 

 contracted at the extremities, present the shape of a 

 barrel *. They also occur acuminated and diverging, 

 sometimes in the form of a rose. In perfect cubes, 

 the apophyllite occurs in Greenland only in the ba- 



* 



* 



'njff* 



salt-tuff, accompanied with delicate capillary meso- 

 type. 



jtf 



* The cylindrical Apophyllite, according to the experiments of Dr Brewster, 

 who has* examined some specimens which I transmitted to him, differs in a re- 

 markable manner from the Apophyllite of Iceland, Faroe, Uto, and Fassa. Its 

 optical properties he has found to be of a very curious kind. 



W .. Sf 





