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RECORDS i>|- THK AISTRAMAN MUSEUM. 



QUAKTZ. 



Howell, N.S.Wales. 



(PI. v., Brr. 4.) 



A fine example ol quai'tz tAviniied on the Japan law fioni tlie Conrail 

 Mine, Howell, was kindly lent for description b}' Mr. D. A Porter. Each 

 segment of the twin is about 4 cm. in length, tapers slightly to the apex 

 and shows the usual prismatic striations. The cr3\stals are flattened in 

 the plane which contains the vertical axes, which seems to be an almost 

 constant feature in twins of this kind. On the faces designated r (there 

 are no means of distinguishing r from _) appear raised etch figures of 

 nnsymmetrical shape as shown in the figure ; on the ~ faces there are 

 somewhat similar hillocks but they are less distinct and their exact form 

 cannot be made out. 



The group was measured with the co-plaiiar faces di and »> polar, as 

 it was found iin{)ossible to mount it in the conventional position ; the r 

 and z faces were utilised in centeriug and the angles obtained were as 

 follows : — 



Stifnite. 



Hillgrove, N.S.Wales. 



(Pi. v., figs. 5, (i.) 



Stibnite occurs commonly in the Northerji disti'icts of New South 

 Wales but (he mineral is usuail}' massive or in columnar and felled 

 aggregates and very few well crystallised specimens are to be found in 



