6 



rence of an aberrant form of axinite rock at Kosetta Head, 

 S.A., the discovery here described is unique in Australian 

 petrology, so far as is known, and moreover the only other 

 recorded occurrence of what may be termed true limurite is 

 that originally detailed by Zirkel. The association of 

 copper ores with the Colebrook rock lends additional import- 

 ance to the discovery, although it is not within the scope of 

 this paper to deal with its economic aspect. 



The specimen sent fairly represents the general charac- 

 teristics of the rock. 



EXPLANATION OF PLATE. 



LlMURITE FROM NORTH-EAST DUNDAS. 



Fig. 1. Limurite. x 14. Crossed nicols. The dark periphery is 

 uralitic augite. The crystals in centre of field are actinolitic 

 hornblende. The white portion is calcite. No axinite in this 

 section. 



Fig. 2. Limurite. x 14. Crossed nicols. The light areas are axinite. 

 The striped portion is calcite showing cleavages. The dark 

 crystals right and left are augite. 



Fig. 3. Limurite. x 20. Crossed nicols. This represents large 

 twinned crystal of augite, bounded by calcite with rhombo- 

 hedral cleavages. 



Fig. 4. Axinite. x 20. Crossed nicols. Section cut through an aggre- 

 gate of axinite crystals. 



