136 PHYSIOGRAPHY. 



PHOSPHATE OF MANGANESE. 



ORE. 



Phosphat of Manganese. JAM. Syst. Vol. III. p. 408. 

 Pitchy Iron-Ore. Id. ibid. Vol. III. p. 248. Phosphat 

 of Manganese. Id. Man. p. 328. Phosphate of Man- 

 ganese. PHILL. p. 248. 



Pyramidal or prismatic. Massive : cleavage in 

 three directions perpendicular to each other, one 

 of them more distinct. Fracture small con- 

 choidal. 



Lustre resinous, inclining to adamantine. Colour 

 blackish-brown. Streak yellowish-grey. Trans- 

 lucent on the edges. Opake. 



Brittle. Hardness = 5-0 ... 5-5. Sp. Gr. = 3-439, 

 VAUQUELIN ; = 3-775, ULLMANN. 



Before the blowpipe it melts easily into a black scoria, 

 is readily dissolved in nitric acid without effervescence, 

 and consists, according to VAUQUELIN, of 

 Oxide of Iron 31-00. 



Oxide of Manganese 42-00. 

 Phosphoric Acid 27'00. 



It has been found near Limoges in France, in a vein of 

 quartz traversing granite, accompanied by rhombohedral 

 Emerald. 



PICROLITE. 



Picrolith (of Hausmanri). LEONH. S. 545. Picrolite. 

 PHILL. p. 209. 



Massive : composition thin columnar. Fracture 



splintery. 

 Lustre faint, inclining to pearly. Colour leek- 



