15.3 



3174, Wallangra; radial form in quartz. 237, Cooma ; elon- 

 gated single crystals. 



8746, Ballala, near Ural] a ; very distinct crystals in tlie rock, 

 pegmatite. 



7337, Oban ; portion of a very large crystal. 



6907, Glen Innes; portion of a large crystal, showing the er.d 

 faces. 



Silicate of alumina. Boulders have been found in Burra Creek, Andalusite. 

 Tumbarumba. 



Silicate of alumina ; in characteristic cross-shaped twin crys- staurolite. 

 tals. A good specimen of staurolite in mica schist will be found 

 among the Broken Hill rocks in case 145. 



A variety of staurolite, containing foreign particles diagonally Chiastolite. 

 arranged. 10104 (polished), magnificent specimens from South 

 Australia. 



Silicate of alumina. Often of a beautiful blue colour. Cooma, Kyanite, 

 Burra Creek (Tumbarumba). In Burra Creek it is found as 

 pebbles. 10011, Alma Mine, near Broken Hill; a blue variety in 

 copper-bearing mica schist. !For a large specimen, see case 145. 



Staurolite, chiastolite, and cyanite are secondary minerals occurring 

 in schists. 



Kussia. This mineral has recently been detected in a rock Ccrdierite. 

 from Broken Hill. 



A silicate of lime, &c., containing boracic acid. Colebrook Axinite. 

 Mine (Tasmania), Namoi Eiver. 



Silicate of alumina with a good deal of fluorine (see page 18, Topaz, 

 and gem-cases 78, 49). Topaz is associated with tinstone in 

 New England and Mount BischofF (see pages 67, 114.) 



The variety at Mt. Bischoff is the radial one, known n.^, pycnite. 



5418, Mourne Mountains, Ireland ; with heryl and felspar 

 occupying cavities {druses) in granite. 



9268, Dingo Creek, Torrington; a blue variety. 



