FAHLUNITE. 97 



It is found in Greenland mixed with dodecahedral 

 Kouphone-spar, hemi-prismatic Augite-spar, and a moun- 

 tain-green variety of prismatic Feld-spar. It was first de- 

 scribed as a particular species by Professor STROMEYEH. 



^FAHLUNITE. 



Triclasite. HAUY. Traite', 2de Ed. T. III. p. 140. Fah- 

 lunite. Tricklasite. PHILL. p. 56. Fahlunite. Hi- 



S1NGEH. 



Hemi-prismatic. P -f oo = 109 28'. HAUY. Re- 

 niform, massive. Cleavage, Pr = 78 28'. P-f- oo. 

 Fracture conehoidal ... uneven, splintery. 



Lustre vitreous. Colour olive-green and oil-green, 

 passing into yellow, brown, and black. Streak 

 greyish-white. Feebly translucent on the edges 

 ... opake. 



Scratches glass, HAUY. Sp. Gr. = 2 61 ... 2-66, 

 HISINGER. 



.sjt!* Before the blowpipe it becomes pale grey, and melts in 

 *jts thinnest edges. It is but slowly dissolved in glass of bo- 

 rax, and communicates to it the colour produced by oxide 

 of iron. In consists, according to HISINGER, of 



Silica 4679. 



Alumina 2673. 



Magnesia 2-97. 



Protoxide of Iron 5-01. 



Oxide of Manganese 0-43. 



Water 13-50. 



It occurs at Fahlun in Sweden, in a talcose or chloritic slate, 

 along with hexahedral Lead-glance, pyramidal Copper-py- 

 rites, &c. It was described by HISINGER under the name of 

 Fahlunite. It is doubtful, whether the forms and hardness 

 given on the authority of HAUY, refer to the same substance. 



VOL. III. G 



