SPH.RULITE. 155 



SORDAWALITE. 



Sordawalite. NORDENSKIOLD. Edinb. Phil. Journ. VoL IX. 

 p. 162. Sordawalite. PHILL. p. 210. 



Massive : composition impalpable ; no trace of 

 cleavage. Fracture conchoidal. 



O 



Lustre vitreous, inclining to semi-metallic. Colour 



greenish- or greyish-black. Opake. 

 Brittle. Hardness equal to that of glass. Sp. Gr. 



= 2 530, NOEDENSKIOLD. 



It becomes reddish by exposure to the atmosphere. Be- 

 fore the blowpipe it forms with difficulty a blackish glo- 

 bule. With a small quantity of soda it yields a blackish- 

 green globule; with a larger quantity a rough slaggy mass 

 is produced. Borax dissolves it into a green glass. It is 

 partly soluble in muriatic acid. Analysis by NORDENSKIOLD ; 



Silica 49-40. 



Alumina 13-80. 



Peroxide of Iron 18-17. 



Magnesia 10-67. 



Phosphoric Acid 2-68. 



Water 4-38. 



It occurs near the town of Sordawala in Finland, in layers 

 from half an inch to an inch in thickness in a primitive rock* 



SPJLERULITE. 



Sphaerulite. JAM. Syst. VoL III. p. 545. Man. p. 330. 

 Sphaerulite. PHILL. p. 209. 



Imbedded spheroidal masses. Surface of some 

 of them smooth, of others rough. Composition 

 columnar ... impalpable. In the latter case the 

 fracture even, splintery. 



Colour various shades of brown and grey. Trans- 

 lucent on the edges ... opake. 



