MINKRAl,()(iICAI, NO PES ANDKUSON. 



203 



Tlie liabit of the crystals on this liaiul specimen are sliowii in the 

 drawing of Crystal No. IV. (PI. .x.xxix., i'l^s. 5, 6), but tlie individual 

 faces var}' cousideiabl}' in size and shape ; the largest crystals approximate 

 to eight mm. in length along the h axis. 



Foi'ms and angles : — 



The new form (368) was observed eight times. It is a fairly large 

 face, but is generally wavy, and the signals are only moderately good ; 

 the limits obtained for the co-ordinate angles were ^ 32° 25' to 32° 46', 



p 48° 38' to 48° 47'. 



Tiie other three specimens from the Comet Mine are remarkable for 

 the size of the crystals. One consists of a single crystal measuring 

 11-5 X 4 X 3-5 cm. (PI. xxxviii., fig. 2). the others are aggregates of 

 crystals, the largest about 3 X 25 X 1"75 cm. (PI. xxxviii., fig. 3). 



