the Ores of Manganese. 141 



ria, at Felsobanya in Hungary, and at Piitten in Austria. Dr 

 POHL observed several localities of it in Brazil, as at St Toao 

 d'el Key, with brown hematite ; on the road between Anta and 

 S ta Rita, in the capitania of Goyaz, and at Banderinha do 

 Caelho in Minas Geraes. In the latter place it includes nume- 

 rous reddish nodules, or cylindrical and ramified concretions of 

 indurated clay. 



The pyrolusite, as was observed above, is very generally found 

 along with psilomelane. In fact, it is seldom found without it. 

 Another species frequently accompanying it, is the brown hema- 

 tite, and these two species, like the pyrolusite and psilomelane, 

 are often very curiously associated with each other. At Arz- 

 berg hi Bayreuth crystals of quartz are found, covered with a 

 stratum of brown hematite, upon which is deposited another dis- 

 tinct stratum of pyrolusite. In some varieties from Berge in the 

 county of Salm, thin stalactites of brown hematite are uniformly 

 covered with a stratum of pyrolusite. The same is found also 

 in masses of larger dimensions at Friedewalde in the county of 

 Sayn, and in these the concentric disposition of the brown and 

 black layers of the two species, visible in the cross fracture, 

 gives the whole a particularly elegant appearance. Pyrolusite 

 occurs in England at Upton Pine, near Exeter, in Devonshire, 

 and in Cornwall. 



The manganese oxide noir barytifere of HAUY, from Komaneche, 

 near Macon, does not appear to be a simple homogeneous mine- 

 ral. When examined with the magnifying lens, it exhibits dis- 

 tinctly a compact and a fibrous substance mixed up with each 

 other. The latter, as far as the minuteness of the particles will 

 allow, shews the properties of pyrolusite, its colour and general 

 aspect, and its hardness ; for even on the fracture newly obtained, 

 this compound soils the fingers, though on the file the hardness 

 appears as high as 5.0 ... 5.5, that is, superior to apatite. The 



