THE METAMORPHIC ROCKS OF ADELIB LAND STILL WELL. 



135 



the three minerals are undoubtedly intimately associated. A very small amount of 

 biotite seems to have developed with the alteration products of the felspar. The biotite 

 always bears evidence of pressure, and the cleavage flakes are either bent or crumpled, 

 or else in shreds. The ilmenite is also affected by the stress, and streaks of black ilmenite 

 dust issue from the ilmenite crystals and traverse the fractured areas. When an ilmenite 

 crystal partakes in the production of mortar structure the pulverised zone is darkened 

 by the ilmenite fragments. Apatite and zircon are present in occasional and relatively 

 large crystals which have been bent and fractured. 



Chemical Characters. 



The following analysis of No. 797 was made by J. C. Watson in the Victorian 

 Geological Survey Laboratory under the supervision of P. G. W. Bayly. In the second 

 column is placed an analysis by H. S. Washington* of acid charnockite from St. Thomas 

 Mount, Madras. 



Si0 2 

 A1 2 0, 



Fe 2 0, 

 FeO . 

 MgO 

 CaO . 

 Na,0 

 K 2 



I. 



72-38 

 13-39 

 0-73 

 1-09 

 0-67 

 1-86 

 2-02 

 6-57 



H 2 O+ 0-44 



H 2 - 

 Ti0 2 . 

 PA . 

 SO, .. 



a .... 



MnO . 

 Li 2 . 



0-12 



0-40 



0-16 



nil 



nil 



tr. 



tr. 



99-83 



Specific Gravity 2-632 



II. 



77-47 

 11-00 

 1-04 

 2-02 

 0-43 

 1-02 

 2-86 

 4-14 

 0-20 

 0-05 

 0-26 

 nil 



nil 



100-59 



Group Values. 



Projection Values. 



Op. oit.. p. 325. 



