132 RECORDS OF THE AUSTRALIAN MUSEUM. 



Crystal i. (Plate xxviii., figs. 1, 2). — This is the smallest and the 

 best crystal ; it measures 1 x -2 x -5 cm. in the axial directions, 

 is practically free from gangue, and (mite transparent. In hahit 

 it is elongated parallel to the a axis, and might almost he 

 descrihed as tabular on (010). 



Combination :~-a c bosir A G D Emkiqpurln. 



Crystal ii. (Plate xxviii., figs. 3, 4). — It is the front half of a 

 crystal, incomplete below, measuring 1*6 x Dl x 1*5 cm., and 

 carries a good deal of attached galena as cleavage fragments and 



small grains. The faces o(110) and k (01 1) are unusually large. 



Combination : — a cb o s k B D mki p F G p. 



Crystal Hi. (Plate xxix., tigs. 1, 2). — This crystal measures Id x 

 •8 x 1*2 cm., and may be described as thick tabular on (010); on 

 100 there is a rounded depression like a small thumb mark ; the 

 left side of the figure is bounded mainly by a cleavage plane. 

 Galena in cleaved lumps is attached to the lower surface. 



Combination : — a c b o s k tv C k r I n H L <fi. 



Crystal ic. (Plate xxix., tig. 3). — The crystal is broken in front 

 and below; size 1-8x1x1 cm. It seems to consist of two sub- 

 individuals not quite in parallel position with galena intruding 

 between. 



Combination : — a c b o C m k nr Ik L(1). 



Crystal v. — This is the largest measured crystal, 2 - 2 x Id x 1-3 

 cm., but it carries much galena. 



Combination : — a cb o k p G fx. 



Of the remaining specimens one consists of several crystals, 

 large and small, accompanied by galena; one broken crystal 

 measures about 5 x 3 x 2-5 cm.; this specimen and crystal v. are from 

 the Block 10 mine. The other is similar, but the crystals of 

 rhodonite and galena are all small, forming a sort of mosaic. 



The mean angles are tabulated below along with the 

 theoretical values deduced from the calculated elements ; the 

 lettering according to G-oldschmidt and Dana, with the corres- 

 ponding .Miller indices, are given side by side; new forms are 

 distinguished by an asterisk. 



The equations for transforming // k I of Goldschmidt to K k 7 

 of Dana are, /t'= - (h + k), k' = - (h - k), I' = - V ; thus any face 

 P, h k I, becomes P', h' k' I'. 



