492 Transaclions. — Geology. 



Calcite. — Dunediu. 

 ^ In rhomboliedral crystals lining an amygdaloidal cavity. The terminal 

 group of rhomboliedral faces (arranged in groups of three) have a bright 

 lustre ; but the faces of the prism or elongated rhombohedron have drusy 

 and brown-coloured surfaces. 



Calcite. — Chalky Inlet. 

 A cleavage rhombohedron ; opaque white, but almost transparent in 



parts. 



Calcite. — Moerald. 



From a septarian ; of a yellow colour ; the under surface is studded 



with dark brown -coloured spots, which are apparently imperfectly-developed 



rhomboliedral crystals. These spots are rich in iron and manganese. 



Before the blow-pipe the yellow colour is changed to black ; due to the 



presence of iron. One side of the specimen is irregular, from the presence 



ol bold, but imperfectly-defined scalenohedral crystals. 



Calcite. — Sunnyside, Dunedin. 



Smoky, translucent crystals of calcite, made up of the rhombohedi'on 

 combined with the scalenohedrou. Associated with them are radiate groups 

 of acicular natrolite crystals. 



Calcite. — Dunedin. 



The crystals are small, fairly well- developed acute rhombohedra, 

 arranged together in a most beautiful little group ; the crystals are of a 

 pleasing brown colour, with drusy surfaces. The calcite crystals are seated 

 upon a thin coating of natrolite, which lines the amygdaloidal cavity. On 

 the brown rosette of calcite is seated, in turn, a pretty little group of clear 

 transparent crystals of some zeolite, apparently skolezite. 



Calcite. — Dunedin. 



In pale yellow transparent rhomboliedral crystals ; Iming a cavity. 



Calcite. — Dunedin. 



Similar to the above. 



Calcite. — Dunedin. 



In small white rhomboliedral crystals, seated on a j)ale brown-coloured 

 calcite, lining an amygdaloidal cavity. 



Calcite.— Diniedm. 

 Group of fairly well-developed rhomboliedral crystals ; pale greenish 



tint, translucent. 



Calcite.- — Sunnyside, Dunedin. 



Small brown translucent crystals, consisting of the scalenohedrou and 



rhombohedi-on combined; associated with one of the zeolites. The zeolite 



fuses easily to a clear glass, without intumcsconce. 



