56 



RECORDS OF THE AUSTRALIAN MUSEUM. 



One good, doubly-terminated crystal from Glen Innes (PI. xx., 

 fig. 4) was measured on the goniometer. It is slightly worn and 

 broken, and very irregularly developed as is usual with zircon, 

 but the reflections are fairly good. The forms present are m, (110), 

 p (111), V (221), n (331) and x (131), the largest faces 

 belonging to m, p and x ; the forms u and v are small, 

 w having only two faces present, while v has but one. The 

 crystals vaiy from clear, colourless to dark red by transmitted 

 light. The measured and calculated angles are tabulated below. 



Sp. g. 4-64. 



Inverell, New South Wales. 



Out of a collection from this locality sent me by Mr. Porter only 

 one crystal Avas sufficiently good for measurement on the gonio- 

 meter. It is doubly terminated, most irregular in development, 

 and the faces are polished and slightly rounded, giA'ing only 

 blurred reflections. It shows only the forms m (110), ^j (111) and 

 X (131), of which VI. is small (PI. xx., fig. 5). Sp. g. 4'66. 



Boat Harbour, near Table Cape, Tasmania.' ■• 



I am indebted to Mr. W. F. Petterd for some crystals of zircon 

 from the above locality, as well as for notes on their occurrence. 

 They are not found in situ, but as waterworn fragments. Mr. 

 Petterd is of opinion that the mineral is a product of contact 

 metamorphism in granite country. The zircon is accompanied by 

 blue sapphires, menaccanite and other detrital minerals. One 

 fairly well developed, doubly terminated crystal w^as determined 

 (PI. XX., fig. 6). The forms present are a (100), m (110), p 



" Petterd— Min. Tasmania, 1893, p. 72. 



