( 413 ) 



claries, and further by somewhat orthoclase. The feldspar shows only 

 a very slight beginning of decomposition ; on the other hand, espe- 

 cially scales of secondary colourless mica, beside them serpentinous 

 products and a few irregular crystals of secondary am pinhole, together 

 with a here and there condensing globulitic troubling, probably caused 

 by limonite, are often met with in the ground mass. Primary bisilicates, 

 therefore, seem to be entirely wanting' in the rock ; the plagioclastic 

 character of the feldspar marks the rock as a basic aplitic facies of 

 microgranite, rich in Na,0. 



The chemical analysis yielded : 



From which follows the following norm : 



32.52 Q = 32.52 j 



12.23 



38.25 I - 62.71 Sal -r 97.58 



quartz 



orthoclase 



albite 



anorth ite 



corundum 



hy perst hen e 



magnetite 



12.23 

 2.35 



0.89 

 0.23 



C 



P 

 M 



2.35 J 

 Fern = 1.12 



If we suppose the rock to be fresh, it takes a place in class I 

 (Persalane) ; Subclass I (Persalone) ; Order 4 (Brittanare), Rank 2 

 (Tpscanase); Subrank 4 (Lassenose). The question, whether it can he 

 placed in the chemical system must be considered however in con- 



