THE VICTORIAN NATURALIST. 191 



fied, cube and octahedron in combination, Victoria United 

 Mine, Ballarat East. These, from their appearance, due to the 

 large number of small, somewhat tarnished faces, have been 

 called copper pyrites by the miners. Cubes, octahedra, and 

 pentagonal dodecahedra (or pyritohedra) are forms of this 

 mineral already recorded from Victoria, but the combination of 

 these two forms, as exhibited, is not explicitly mentioned in 

 either of the above papers. 



Crystals on Dolomite in quartz, South Star Mine, Sebastopol, 

 near Ballarat. These show combinations of cube and octahedron 

 sometimes with faces of a dyakis dodecahedron or diploid. I 

 find no previous mention of this crystal form from Victoria. 



Groups of Pyrite cubes from the mullock-heap of the Great 

 Buninyong Estate Co.'s 1898 shaft. These were in soft, decom- 

 posing state, and were surrounded by smaller crystals of Pyrite in 

 non-coherent clusters. No regular arrangement of the cubes is 

 observed. 



Compact ovoid aggregates of crystals of Pyrite in slate, from a 

 mullock-heap of one of the Midas group of mines at Bald Hills, 

 north of Ballarat. One of these aggregates is ground to a smooth 

 surface in the direction of its length and shown to be compact 

 and finely crystalline throughout. 



Slate with Pyrite cubes from Castlemaine. In splitting the 

 cubes were found to persistently adhere to the one side of the 

 slate, so that specimens show projecting crystals on the one side 

 and impressions on the other. 



II. Pyrrhotite and Chalcopyrite. — In granite from a quarry 

 at the Gong Gong Reservoir, near Ballarat. These minerals 

 occur along lines in the granite, and the latter occasionally dis- 

 seminated, especially in fine-grained patches of the granite. 



In an outcrop of granite about a mile south, at Warrenheip, 

 Molybdenite occurs. 



III. Calcite and Aragonite. — In basalt from the railway 

 cutting at Warrenheip station. 



The Aragonite is in simple crystals, prism with brachypinakoid 

 faces largely developed, sometimes making crystals like flat 

 blades with bevelled edges. The crystals are in diverging tufts, 

 and are terminated by macrodomes and brachydomes. Well- 

 developed terminations are not common in the Aragonite in our 

 basalt (Ulrich). 



The Calcite is in globules and in cylindrical rods attached 

 to the walls of the cavities at both ends. These rods, when 

 broken are seen to possess a triad symmetry in their structure 

 as shown in the cross section, agreeing with the symmetry of the 

 Calcite crystal. 



IV. Dendritic markings of Oxide of Manganese on the Calcite 

 Goating the cavities in basalt from the Yarra new cut, near the 

 Botanical Gardens bridge. 



