or Prisjnatic Manganese Ore. 307 



minute crystals. In this manner it occurs in the mines of de- 

 composed sparry iron in beds in gneiss at Huttenberg in Ca- 

 rinthia, at Schmalkalden in Hessia, and other places. It is 

 likewise found in this manner in the counties of Sayn, Siegen, 

 Salm, and Hamm in Prussia, in the veins of sparry iron tra- 

 versing clay-slate, which are decomposed in the upper levels, 

 and then contain much brown hematite. The localities are 

 chiefly Friedewald and Knorrenberg in the district of Kirchen, 

 Sayn ; Streitberg near the town of Siegen, and Horhausen and 

 Herdorf, Siegen ; Berge, Salm ; the mine Huth, near Hamm. 

 One of the varieties from Horhausen is particularly remark- 

 able for the delicacy of the fibres, which are disposed in small 

 tufts within the geodes of brown hematite, and which greatly 

 resemble the fibrous varieties of prismatoidal antimony-glance. 

 There are specimens of it in the imperial cabinet in Vienna, and 

 in that of Mr Von Struve in Hamburg. Weyer in the county 

 Wied-Runkel, Hirschberg near Ahrensberg, and Bendorf on 

 the Lower Rhine, are likewise named as the localities of superb 

 specimens of pyrolusite. Krettnich on the Blies, west of the 

 Rhine, is likewise one of its localities. Similar varieties occur 

 in the iron mines of Bayreuch, as at Armnehulfe near Schnar- 

 chenreuth, and at Arzberg, in those of Platten, for instance 

 Hilfe Gottes, and of Schwarzenthal in Bohemia, in those of 

 Johanngeorgenstadt, Eubenstock, Langenberg, and others in 

 Saxony, also at Reinerz in the county of Glatz, and at Con- 

 radswaldau in Silesia. 



The finest crystals of pyrolusite occur at Schimmel and Os- 

 terfreude near Johanngeorgenstadt, and at Hirschberg in 

 Westphalia. These are chiefly short thick prisms, terminat- 

 ing on their extremities in numerous fibres. Large flattish 

 crystals of great beauty, terminating in sharp elongated pyra- 

 mids, with curved faces, occur at Maeskamezo, near Maggar 

 Lapos, south of Kapnik in Transylvania, in geodes of brown 

 hematite, and associated with crystals of quartz. This variety 

 is found in a thick bed, of no great extent, of brown iron-ore 

 in gneiss. A similar one occurs also in a similar position at 

 Gyalarn ear Vayda Hunyad in the same country. Cleavable 

 individuals of considerable size are found near Goslar in the 

 Hartz, in a mountain called Gingelsberg, near the Rammels- 



