MlNERALOfilCAL NOTES — ANDERSON. 95 



is at once apparent from the reentrant angles on the edges, and 

 the three systems of striations on the basal plane, which are well 

 seen under the microscope, crossing at angles of approximately 

 60'^, and running parallel to the brachy-axis of each individual. 

 Crystals of a similar habit have already been observed in aragon- 

 ite, but pi-ismatic crystals seem more common with cerussite. 

 One lot of isolated crystals of a pronounced yellowish colour 

 average 6 mm. in diameter. A few smaller crystals measuring 

 about 1 mm. in diameter, translucent, and of a much paler colour 

 were obtained implanted on the matrix. These latter supplied the 

 best measurements on the goniometer. The most prominent face 

 after the basal plane is the pyramid o (112); only one doubtful 

 angle could be referred to the prism /■, which is accordingly 

 not entered in the figure. Tlie forms recognised are c (001), o 

 (100), b (010), v>. (110), i (021), k (Oil), p (111), o (112). The 

 drawing suggests Laspeyre's figure of aragonite from Oberstein, 

 only our crystal has more forms, and is drawn in ideal symmetry. 

 The measured agree well with the theoretical angles. 



PI. XX., fig. 3 is a stereographic projection showing all the 

 forms recognised on Magnet cerussite and the principal zones. 



ZIRCON. 

 Glen Innes, New South Wales. 

 Mr. D. A. Porter has been kind enough to lend me for descrip- 

 tion some crystals of zircon from Glen Innes and Inverell, both in 

 the New England district of New South Wales. In a paper read 

 before the Royal Society of New South Wales, Mr. Porter gives 

 an exhaustive description of the occurrence of zircon in this 

 district.'-* " In the Inverell District zircons are found in many 

 places over a large area, chiefly of basaltic country, forming the 

 watershed of the Macintyre River on the northern side, and 

 extending from N. to E.S.E. from Inverell. They occur princi- 

 pally in the beds of streams, or scattered over low sloping ridges, 

 and in the beds of clay and boulders, which form raised beaches 



along the creek sides in many of the localities The 



zircons from these several localities mentioned, are usually more 

 or less broken or cleaved, and very much worn and smoothed, but 

 occasionally in fairly perfect crystals, of which figures 1 and 2 are 

 representations." Glen Innes and Inverell are about thirty miles 

 apart and we may take it that the zircon found at both places is 

 similar in origin. 



12 Porter— Journ. Eoy. Soc. N. S. Wales, xxii., 1888 (1889), pp. 82-83, 

 pi. 1., figs. 1,2. 



