128 



PHYSIOGRAPHY. 



Pyrolusite Pyromorphite. 



numerous fibres. Large flattish crystals, of great beauty, terminating in 

 sharp elongated pyramids, with curved faces, occur at MaeskamezK, 

 near Maggar Lapos, south of Kapnik in Transylvania, in geodes of 

 Limonite, and associated with crystals of Quartz. Cleavable individu- 

 als, of considerable size, are found near Goslar in the Hartz, in a moun- 

 tain called Gingelsberg. They are imbedded in small veins of Quartz 

 and Calcareous Spar, in clay slate. Distinct, though small crystals, are 

 met with in many of the mines in the west of Germany. A variety oc- 

 curs at the mine of Antonio Pereira near Villa Ricca in Brazil, along 

 with Limonite and Psilomelane. Small granular Pyrolusite occurs in 

 Dalecarlia, Sweden. But the individuals are often much smaller, and 

 appear in the form of a black sooty substance. Such are frequently 

 found in the iron mines of Raschau, and other places in Saxony. The 

 Pyrolusite is rarely found without Psilomelane; and is also very gene- 

 rally associated with Limonite. In some varieties from Berge in the 

 county of Salm, thin stalactites of Limonite are uniformly covered with a 

 stratum of Pyrolusite. Pyrolusite occurs at numerous 'places in Eng- 

 land. 



It is very abundant in the United States. It occurs at Bennington, 

 Monkton, Chittenden, and various other places in Vermont, crystallized 

 and granular, and associated with Psilomelane ; in Massachusetts, at Con- 

 way, in a vein of Quartz; at Winchester, (N. H.) ; in Connecticut, at 

 Salisbury and Kent, in thin velvety coatings, upon Limonite. 



PYROMORPHITE. Brachytypous Lead- 



Baryte. PARTSCH. 

 Primary form. Regular hexagonal prism. 

 Secondary form. 



Fig. 347. 



