Palache and Wood — Crystallographio Study of Millerite. 357 



Crystal. Signal. 



25 fair 



Calculated 



m, (0-18-18-1). Only one face of tl 

 yielded two signals of fair quality. 



Crystal. Signal. 



24 fair 



24 

 Calculated 



No stress is laid on the probability of the occurrence of I 

 and ?n. The faces were plainly visible in both cases. 



Doubtful Scalenohedrons. 



71, (5276). This form was found on three crystals, in one 

 case four of its faces being present. The data follow : 





Eeadings. 











p 



29' 



25' 



73° 



05' 



30 c 



00' 



73° 



37' 



? ori 



n was found 





Eeadings. 

















30 L 



00' 



82° 



32' 



30 c 



00' 



80° 



20' 



30 c 



00' 



81° 



38'' 



Crystal. 



Signal. 



t 



-Eeadings. 



> 











*i 



P 



5 



good 



104° 52' 



15° 08' 



21° 18' 



5 



poor 



133° 21' 



13° 21' 



21° 18' 



8 



poor 



133° 14' 



13° 14' 



21° 22' 



8 





46° 39' 



13° 21' 



21° 22' 



8 





73° 01' 



13° 01' 



21° 22' 



8 



very poor 



166° 45' 



13° 15' 



21° 22' 



14 



poor 



167° 14' 



12° 46' 



21° 26' 



Mean 



poor 





13° 26' 



5 21° 21' 



Calculated 







13° 54' 



21° 29' 



Although we have left the form in doubt it is clear that it is 

 more than indicated. The agreement of measurements with 

 calculations is only fair, but there are many faces well distrib- 

 uted. 



o, (7 * 4 * 11 • 9). This form was found on three crystals, in 

 one case four faces being present. The data are given in full : 



V^i. J OUCIJ.. 



tJi & JJ.O;I. 



<P 





<P 



1 



f 



> 



5 



poor 



8° 



52' 



8° 



52' 



22° 



03' 



5 



very poor 



50° 



58' 



9° 



02' 



22° 



00' 



8 



extremely poor 



= o 

 / 



30' 



7° 



30' 



21° 



22' 



18 



poor 



9° 



51' 



9° 



51' 



21° 



19' 



18 



extremely poor 



171° 



40' 



8° 



20' 



21° 



51' 



18 





128° 



24' 



8° 



24' 



21° 



36' 



18 



poor 



49° 



46' 



10° 



14' 



21° 



09' 



Mean 



very poor 







8° 



53' 



21° 



37' 



Calculated 







8° 



57' 



22° 



03' 



This form, therefore, is not to he rejected without consideration 

 although the data cannot be said to establish it. 



