98 



The number of pieces of the minerals gathered at Nar- 

 sarsuk is, with regard to most of them, very small; only of 

 two of them, viz. Catapleiite and Astrophyllite, a greater number 

 of partly very fine pieces have been collected. 



(r) 

 (r) 



Calcite. 



This mineral was found rather abundantly, but, as is 

 generally the case from this locality, only in small and insigni- 

 ficant crystals. Most frequently they are of a quite simple 

 form, viz. a combination of r{l01l} and a(ll20) with both 

 surfaces about equally developed, so that the form gets some 

 resemblance to the isometric dodecahedron; to this form may 

 be added small surfaces of c{000l); the size of these crystals 

 is Ь — 2 cm; their colour is brownish; the surfaces are very 

 uneven, partly grooved and partly faceted. 



In a few pieces numerous small crystals were found 

 (c. 1 mm) of a somewhat more compli- 

 cated form, viz. c{000l}, r{l0Tl}, 

 /"{0221}, «{4483}, and a hitherto un- 

 known scalenohedron {•/■) (б. 10. 16. l) 



(fig. 1). 



The surfaces of this latter form 

 are very curved, and it cannot be re- 

 garded as absolutely certain, as the 

 measured values of the angles vary 

 rather much; there is, however, no 

 more probable form, which agrees, only 

 approximately, with the values found: 



. Number 

 Average e ir • »• 

 , * of mea- Variations 

 value. 

 surements. 



(г)==(6.10.Тб. 1):(16.TÖ.6. 1) = 75°52' 7 74°Ô8'-78°33' 76° 1Ц' 



(r) = (6.10.T6.1):(6.16.Ï0. 1) = 43°37' 6 41°39'-44°42' 43°27' 



(^)==(6.10.Ï6.1):(10.6.Ï6. Г) = 17°43' 4 16° 57'.- 19° 10' 18° 23' 



:c =(6.10.16.1): (0001) = 8o°22' 5 84°0' -88° 13' 85°51У. 



Fig. 1. Calcite; 

 Narsarsuk. 



Calculated 

 value. 



