138 



IGNEOUS ROCKS 



Upper 

 Gallery. 



Wall-case 1. 



55. — Pearlstone (" Perlite-lithoide " Beudant). — Two 

 miles west of Glashiitte. 



56. — Pitchstone porphyry, composed of crystals of 

 felspar in a pitchstone base. — From a block at the foot of 

 Mount Altes Schloss, Glashiitte. 



57. — Porphyritic Greenstone, containing 



spherical 



concretions from the mine called Stephani Schacht. 

 58. — Concretions, from the greenstone, No. 57. 

 59. — Compact greenstone. 

 60. — Greenstone, discoloured, and 



cubes of iron pyrites. 



containing 



small 



61. — Earthy greenstone, west slope of Schobobner- 



berg. 



62 & 63. — Altered greenstone, with a small quantity 

 of iron pyrites, from the hanging wall of a branch of the 

 Theres gang (Theresa vein), north of Georg Stolln. 



64. — Porphyritic greenstone, from the summit of 



Paradeisberg. 



65. — Porphyritic greenstone, from the east slope of 



Paradeisbera . 



66. 



Greenstone porphyry, occurring in several va- 



rieties near the mouth of the Ferdinand Adit, being the 

 first rock pierced by it. — Georg Stolln. 



67. — Earthy greenstone porphyry, composed of crystals 



of Albite 



/< 



crystals of black 



# r 



mica, with some hornblende in a felspatho-hornblendic 

 base: 100 yards west of Tepla. 



68. — Earthy dioritic porphyry, composed of crystals 

 of Albite {soda felspar) in a hornblendic base : 400 yards 

 west of Tepla. 



69. — Augitic porphyry, from the trachytes, east of 



Mt. Szitna. 



70 & 70a. — Earthy trachyte, sent to Vienna, and 

 used as porcelain earth ; from the conglomerates, west of 

 Prinzendorf and south of Mount Szitna. 



71. — Porphyritic trachyte, with angite and glassy 

 felspar, summit of Mount Szitna. 



i 



t 







