(410) 



resorption-zones of the aniphibole-phenoerysts, even there, where they 

 assume more considerable dimensions (to 0.1 mm.), must be consi- 

 dered as resorption-products. The glass of the groundmass contains 

 magnetite in octrahedrons, grains and prisms of apatite and of zircone, 

 and is everywhere pushed away by libres and little scales of a 

 green chloritic product, strongly accumulating round the aniphibole- 

 phenoerysts and having formed principally at the cost of the secondary 

 amphibole secreted in the resorption. 



The analysis of the freshest material gave the following results: 



from which follows the composition : 



Sal 



84.81 



Fern 



12.69 



The rock therefore belongs to Class II (Dosalane) ; Subclass I 

 (Dosalone); Order 4 (Austrare) ; Rank 3 (Tonalase) ; Subrank 4 

 (Tonalose). The greater basicity with respect to the above mentioned 

 rocks shows itself chemically in the decrease of the Si0„, the increase 



