ON SOME NEW SOUTH WALES AND OTHER MINERALS. 235' 



The second specimen of native bismuth shown is from Mary- 

 borough, Queensland. It occurs in masses of calcite which possess. 

 large and well-marked rhombohedral cleavage planes ; cobalt is. 

 also said to occur in association with it, together with gold. 



The occurrence of native bismuth in calcite is very unusual. 

 Calcite. 



From vugs in the Umberumberka Mine. In rounded groups, 

 of scalenohedra, of a greenish tint (much resembling prehnite in 

 appearance) seated on grey granular limestone. In other speci- 

 mens the calcite is in the form of flattened rhombohedra. 



Emerald — Beryl. 



From near Vegetable Creek, New England ; where it occurs. 

 in veins or fissures containing kaolin, running through the granite 

 near its junction with clay slate. The crystals are mostly under 

 a quarter of an inch in diameter and are usually much fissured or 

 fractured. In colour they vary from shades of beryl green to 

 fairly deep emerald green, but I have not yet seen any of the rich 

 deep shade characteristic of the finest emeralds, nevertheless they 

 afford good ornamental stones, fit for jewellery. 



Many of x the crystals occur in groups or bundles. Associated 

 with them are tinstone, topaz, and other minerals. 



Galena. 



From Umberumberka Mine, with coarsely crystalline fracture; 

 this specimen is chiefly interesting on account of its containing 

 intermingled scales of black mica. 



Hornblende. 



A white variety with a radiate fibrous structure. In appear- 

 ance it resembles tremolite, but requires further examination. 

 The specimen exhibited is from the Ada Augusta near the Angus. 

 Mine, where it occurs in a fissure lode some four to five inches, 

 wide. With it is associated a good deal of quartz, some galena,, 

 blende and pyrites. 



