28 DOMAIN I. SIDEROUS. 



various mixtures of siderite, mica, basalt, and 

 quartz, may also sometimes be referred to this 

 Mode*. 



Basalt, with mica, from Upland in Sweden. 



Green basalt, with black mica, and sometimes 

 a mixture of quartz, from Westmania, 



The basaltin of Kirwan is merely crystallised 

 hornblende, or siderite ; but the basaltin of Baron 

 de Born is often the real basalt of the ancients, 

 whjle his basalt is here called basaltin. He men^ 

 tions that kind, mingled with green siderite and 

 olivine, from Bohemia; and that mingled with 

 brown mica, from the same country. In his 

 treatise on traps, Faujas confines himself to the 

 basaltins, or fine-grained basalts ; he mentions a 

 trap, sometimes black sometimes green, with grains 

 of semitransparent quartz, from Scotland and Pro- 

 vence, which may probably be classed among the 

 ancient basalts f. The pillars of grunstein, which 

 compose the innermost circle at Stonehenge, may 

 also belong to this division J. 



* i. 437- 



f* Launay, Essai sur les Roches, 64, mentions a mixture of trap 

 and felspar, from the isle of Bornholm, Denmark. 



J Townson's Tracts ; whence may also be added the whin of 

 Salisbury Craigs, near Edinburgh, containing siderite and felspar. 



