BY H. I. JENSEN. 705 



schists, and more or less rudely stratified rocks having the 

 appearance of altered tuffs. 



The Conandale glaucophane schist is associated with perfectly 

 stratified schistose rocks, which have certainly been laid down by 

 the aid of water; but fossils I have never met with in them. 

 This last characteristic, so common with the metamorphic rocks 

 of the East Moreton area, may indicate that these rocks, even 

 when stratified, are primarily of volcanic origin, having been 

 redistributed by water. The chemical composition of the Conan- 

 dale glaucophane schist, as shown above, is such that it might 

 easily have been derived from a basaltic tuff. 



The calculation of the norm of these rocks in terms of glauco- 

 phane, epidote, actinolite, chlorite, perofskite, etc., brings the 

 norm of these rocks into very close agreement with the mode. 



There is reason to believe that the Mount Mee glaucophane 

 rock, associated as it is with chloritic schists, etc., owes its patches 

 of deep blue colour partly to the incipient alteration of its con- 

 stituents to chlorites like delessite and chloritoid. 



The glaucophane of the Conandale specimen approaches 

 actinolite in character, and is probably either an intermediate 

 variety or a mixture of these hornblendes. This, too, is evident 

 from the norm. 



