"236 a. liversidge. 



Hyalite. 



A variety of opal but without its play of colours. Associated 

 with green copper stains ; occurs in a gossan near the Acacia Dam, 

 Broken Hill. 



Garnet — Common. 



In more or less perfect crystals (combinations of the rhombic 

 •dodekahedron and ikositetrahedron) of a dark red and almost 

 black colour, embedded in calcite and associated with a dark green 

 massive and a black fibrous hornblende. From the Acacia Dam, 

 Broken Hill. 



Other specimens are massive with a granular structure. 



Another specimen, also with a granular structure, in this case 

 the grains show more or less perfect crystal faces of a red-brown 

 colour; cutting through the mass are some small veins of white 

 quartz. Mr. Marsh states that it occurs as veins and irregular 

 deposits running through the basic rocks and mica schists of the 

 Broken Hill district, and seldom with the granitic rocks, and 

 that it is usually associated with the argentiferous lead deposits. ; 



Hematite — Auriferous. 



Mount Morgan, Queensland. In mammillated stalactitic masses 

 with, in some cases, a beautiful sheen of iridescent colours. These 

 stalactites usually have the appearance both externally and intern- 

 ally, when broken across, of being composed entirely of brown 

 haematite, but on placing solid pieces of them in hydrochloric acid 

 the iron oxide dissolves and most of them leave a more or less 

 complete skeleton or inner framework of silica. Some of the 

 smaller stalactites after such treatment appear as if made of trans- 

 parent gelatine, from the silica being left in the colourless and 

 gelatinous condition. The gold present seems to be much more 

 intimately connected or associated with the silica than with the 

 haematite. The haematite and quartz appear in some cases as if 

 they had been in part deposited simultaneously, but in many other 

 instances the haematite forms the external coating and therefore 

 is the last or most recently deposited. 



