I H PHYSIOGRAPHY. 



Rather brittle. Hardness = 4-0... 45. Sp. Gr. = 

 3 077, HAUSMAXN. 



Before the blowpipe it becomes reddish-brown, and de- 

 velopes fumes of muriatic acid. In a strong fire it melts 

 first into a black scoria, and then into a globule, which is 

 attractable to the magnet. It is easily soluble in glass of 

 borax, and consists, according to HISINGER, of 

 Silica 35-850. 



Protoxide of Iron 21-810. 



Protoxide of Manganese 21-1 40. 

 Muriate of Iron, with excess ^ 14.095 



of base ) 



Lime 1-210. 



Water 5-895. 



It was discovered by Messrs GAHN and CLASON, in the 

 iron-mines of Nordmark in Wermeland in Sweden, and 

 is associated with rhombohedral Lime-haloide and parato- 

 mous Augite-spar. 



The forms of Pyrosmalite are considered by HAUY as 

 belonging to the prismatic system. It will probably be 

 found to belong to the genus Pearl-mica. 



RADIATED ACICULAR OLIVENITE. 



Radiated Acicular Olivenite. JAM. Syst. Vol. II. p. 335. 

 Oblique Prismatic Arseniate of Copper. PHILL. p. 318. 



Hemi-prismatic. Form frequently similar to Fig. 44. 

 having the most acute solid angles replaced by a 

 face tf. Inclination of M on M = 56 0', of P 

 on M = 95 (X, of P on d (contiguous to the 

 same summit) 99 30', according to PHILLIPS. 



Lustre pearly upon the face of perfect cleavage. 

 Colour dark verdigris-green, inclining to sky- 

 blue, still darker on the surface. Streak verdi- 

 gris-green. Translucent on the edges. 



