702 ON A GLAUCOPHANE SCHIST FROM CONANDALE RANGE, Q. 



The glaucophane schist from the Conandale Range is a fine- 

 grained, dark schistose rock. In appearance this rock has no 

 resemblance to the Mount Mee glaucophane rocks described by 

 me. Under the microscope it is seen to be tolerably even-grained, 

 and to be laminated in such a way that layers of amphibole 

 crystals alternate with layers of fine granular quartz and felspar. 

 The structure is very like schlieric structure in gabbros. Mag- 

 netite is present, generally collected along the division-lines 

 between the layers of hornblende and of colourless minerals. 



The amphibole consists of hypidiomorphic grains of a bluish- 

 green glaucophane having the following scheme of pleochroism — 



C sky-blue^ b greenish^ a yellowish. 



The extinction angle is 10° (r : c = 10°) and the mineral is 

 optically positive. In character it is, therefore, allied to both 

 glaucophane and actinolite. 



A chemical analysis of this rock was made, and the result is 

 stated below, with the analysis of the glaucophane rock from 

 Mount Mee stated for comparison {cp. mj' paper, loc. cit.). 



