364 Ernest W. Skcais : 



Boat-shaped Australife presented hy Mr. Charles DWlton to 

 Geolor/ical Museum of the University. 



Measurements. — The weight determined by the chemical bahiiice 

 is .4632 grams. 



The specific gravity determined by Joly's spring balance is 2.4.''). 



Length of australite is 20 mm. or || inch. 



Breadth of australite is 9.5 mm. or | inch. 



Maximum thickness is 3 mm. or yL- inch. 



Breadth of australite, excluding the flange, is 4 mm. or wV inch. 



Appearance of Australite. 



General characters. — The specimen is more or less boat-shaped. It 

 is elliptical in outline, with an upper surface, whose central part is 

 approximately cylindrical, and with a flange curved upwards, im- 

 parting a general concave appearance to the upper surface. Much 

 of the flange has been lost by fracture, but in one place appears 

 to be unbroken, and there the outer rim of the flange is slightly 

 curved back, and appears to be fluted. The specimen is bottle- 

 green to black in colour. 



Concave or upper surface. 



The central convex or cylindrical portion has a slight constric- 

 tion or " waist " developed half-way Ijetween the extremities. The 

 latter taper off towards a point. The surface of the central por- 

 tion shows small hemispherical pits, but most prominently de- 

 veloped, especially near the junction with the flange are long, semi- 

 cylindrical grooves, running generally parallel to the longer axis 

 of the australite, and curving in at the " waist," and outwards 

 beyond it. A few short grooves run nearly at right angles to 

 these across the central convex portion. The flange does not show 

 a constriction to a " waist," and exhibits on its surface small 

 hemispherical pits. 



Convex or lower surface. 



This shows a few longitudinal grooves near the flange, but the 

 general surface is covered with a large number of pits, some small 

 and hemisphei-ical, others large and flatter, as if adjacent pits 

 had become confluent. 



