CO DOMAIN 1, SIDEKOUS. 



STRUCTURE II. WITH SMALLER CRYSTALS. 



Aspect 1. Red. Of Egypt, the felspar being 

 frequently in white or in flesh-coloured prisms ** 



The same, with white only, the porphyry of 

 Pliny. It is sometimes interspersed with masses 

 of a lighter or darker colour. 



The same, from Corsica, from Lesterelle in 

 Provence, Scotland, Sec. 



The same, with crystals of siderite, 



Aspect 2. Brown. Of this Ferber mentions 

 two varieties; the liver brown with light green 

 spots, and the dark brown with spots half black 

 and half green; perhaps he means crystals of 

 black siderite and green felspar. 



Dark brown porphyry, speckled with numerous 

 small crystals of felspar, and others of siderite 

 and quartz, with reddish and green nodules, from 

 Sweden, where it is manufactured and takes a 

 high polish. 



Aspect 3. Black. Entirely resembling the red, 

 except in colour. Of this there are two large 

 columns in a church near the gate of St. Paul, at 

 Rome. 



* Wad, 12. 



