THE HEART OF THE ANTARCTIC 



length, found abundantly scattered about the old crater 

 of Erebus. These had apparently been expelled by the 

 explosive force of steam from the molten lava in which 

 they occurred. 



Epidote, actmolite, tourmaline and calcite in the form 

 of marble, were abundantly developed in the vicinity of 

 Cape Bernacchi. In the marble cubes of graphite and 

 iron pyrites, together with some tetrahedra of copper 

 pyrites, were observed. In a moraine in this vicinity also 

 a boulder of reef quartz containing iron pyrites was 

 observed. Natrolite was found in seams in boulders of 

 basic lava in a moraine near Mount Larsen. Titanium 

 minerals appeared to be abundant in the eruptive rocks 

 and schists met with between Granite Harbour and 

 Mount Larsen. 



An important occurrence of mirabilite near Cape 

 Barne was noted by Priestley. This he found in rough 

 masses several pounds in weight piled up at the northern 

 end of one of the lakes. It is at a situation some height 

 above the present lake level, but no doubt owes its origin 

 to salts originally contained in the lake water. Gypsum 

 was found by Joyce in fissures amongst the kenyte at 

 the Penguin Rookery, Cape Royds. Mixtures of mag- 

 nesium and and sodium sulphates, apparently originally 

 derived from the sea, are to be found under most of the 

 loose stones in the neighbourhood of Cape Royds. Sea 

 spray and blown saline snow has no doubt carried these 

 salts to their present resting-place. 



