the Ores of Manganese. 181 



in botryoidal, reniform, and stalactitic shapes, frequently alter- 

 nating with each other in layers of different thickness. Speci- 

 mens of this kind are found at Knorrenberg in the district of 

 Kirchen, county of Sayn, and other localities of the Wester wald 

 in Prussia, at Schwarzenthal in Bohemia, and at Arzberg in Bay- 

 reuth. It happens still more frequently that the two species are 

 less regularly intermingled ; or that they are disposed longitudi- 

 nally, the slender crystalline portions of pyrolusite forming rami- 

 fications within the botryoidal and stalactitic masses of psilome- 

 lane. Particularly fine examples of this kind occur in the mines 

 of Siebenbriider and St Johannes, near Langenberg in the mining 

 district of Annaberg in Saxony, also at Conradswaldau and Neu- 

 kirchen in Silesia. Various places in the western provinces of 

 Prussia are productive of most beautiful claviform, stalactitic and 

 botryoidal specimens of psilomelane, as in the Hollert iron-mines ; 

 also in the county of Hanau in Hessia, particularly at Pfaffen- 

 seifer and Bieber. It is a very common mineral in the Saxon 

 Erzgeburge, chiefly in the veins of red ironstone, which traverse 

 gneiss ; and occurs at Schimmel, and other mines near Johann- 

 georgenstadt, at Raschau, at Vater Abraham near Scheibenberg, 

 at Spitzgleite near Schneeberg, and others. From one of them, 

 I could not learn which, there are pseudomorphous crystals in 

 the shape of the octahedrons of fluor ; they are now in the Royal 

 Museum at Berlin, and were brought there in 1813 by Mr STROM. 

 Psilomelane is also found at Reinwege in Gotha and Ilmenau in 

 Weimar, as also in the territory formerly belonging to the Elec- 

 tor of Treves, and in the Upper Palatinate. It occurs at Busau, 

 in the manor of Jessenitz in Moravia, in nodules of limestone, 

 and these varieties in particular have a very strong lustre. It 

 was brought by Mr PARTSCH from Arshitza near Jakobeni in the 

 Bukovina. At Rhoniz in Hungary it is met with in brown he- 

 matite. At Vondernberg in Stiria psilomelane was found by Pro- 

 fessor RIEPL in a vein traversing the decomposed sparry iron. 



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