99 



The surfaces of (y) (б. 10. 16. l) are tolerably bright; of 

 the other forms c{000l}, /"{0221}, and «{4483} have very 

 bright and plane surfaces, giving very good reflections; r{l01l}, 

 on the other hand, has always completely uneven and rough 

 surfaces. 



Syncbysite. 



Of this mineral only a slight material has been obtained. 

 Part of it belongs to the forms of the mineral described by 

 G. NoRDENSKiÖLD^l and Flink "); but some crystals are also found 

 which deviate highly from the 

 forms hitherto known, being 

 very markedly hemimorphic, so 

 that there can scarcely be any 

 doubt that the syncbysite be- 

 longs to the rhombohedral- 

 hemimorphic class. 



The crystals are rather 

 small (up to 4 mm), and are 

 bounded by the forms : с (oOOl), 

 c'{000T}, ^{2029}, ^'{2029}, M {0229}, w'{0229}, «{3035}, 

 a {ЗОЗ2}, ß {ОЗЗ2}, ß' {0332}, and the hitherto unknown forms : 

 o{ll23}, and o'{ll23}. The most common appearance of the 

 crystals is shown in flg. 2. The hemimorphisni is seen in the 

 fact that one end of the crystals is always broader than the 

 other, which is formed as a regular hexagonal pyramid with a 

 base. With this end the crystals are often attached to the 

 substratum; but as often they are placed horizontally, so that 

 the hemimorphism cannot be owing to the position of the 

 crystals. Otherwise we stand in great need of better material 

 of the mineral than has hitherto been at our disposal, in order 



Fi 



ö- -. Syncbysite; 

 Narsarsuk. 



1) Geol. Foren. Förh. Stockholm, 16, 1894, p. 338. 



2) Meddel, om Grønland, 24, 1901, p. 39; and Bull. Geol. Inst. Upsala, 

 5, part 1, 1900, p. 81. ' 



