258 



100.54 

 Density - 3.222 



Another type varies from a creamish white throucrh violet-grey 

 to a light-green, coarse-grained rock. This rock consists almost 

 entirely of monocliuic pyroxene, partly diallage, and some inter- 

 stitial talcose mineral and serpentine. It is difficult to determine 

 the limits of these rocks, and often, also, to decide whether 

 the rock is in situ or not. 



A spur descending from a point near the top of the Kangaroo 

 Spur southwards to the Dolodrook River to a point above the 

 junction of Thiele's Cfeek, shows a number of outcrops of the 

 monoclinic pp-oxene rocks, which are most probably in situ. Thin 

 sections of these rocks frequently show considerable granulation 

 and deformation of the constituents, indicating the intensity of 

 the pressure to which the rocks have been subjected. Occasional 

 foreign fragments have been noted in the slides, and have beon 

 no doubt picked up by the magma. 



An analysis of a creamish-white rock, representing a somewhat 

 altered type of the monoclinic pyroxene rocks, with some inter- 

 stitial talcose mineral, is also due to Mr. Ampt. 



100.30 

 Density - 3.237 



