a New Mineral from Pent. 



203 



No. of 

 faces 



Measured 



Limits 



6 



* 



(010) 6 

 (-230) 10 

 (530)* 7 

 (101) 1 

 (012) 3 

 (032) 5 

 (111) 7 

 (121) 1 



12 



00°34'90°00' 00°00'- 1 

 ob 00 90 00 54 12 - 55 49 

 74 30 90 00 73 32 - 75 40 

 ■90 35 50 17 87 05 - 95 35 49°56' 

 2 33 16 25 14 - 4 

 1 53 41 32 36 - 4 

 65 34 54 00 64 51 - 66 

 -45 00 59 33 



44 15 25 

 23 41 24 

 51 53 28 



50°33' 



-17 10 

 ■41 42 

 -54 55 



Calculated 

 $ p 



00°00' 90°00' 

 54 37 90 00 

 74 08^90 00 



90 00 



4 13 



1 34 



65 05 



45 59 



50 17 

 16 16 

 41 06^ 

 54 05 

 59 09 



* This prism should probably be replaced by the prism with the simpler 

 indices (210). The latter gives excellent zonal relations with the terminal 

 planes which is not true of (530) The crystal has been drawn as though 

 the form were (210) which requires an angle <p of 76° 41'. The observed 

 angles showed none as large as this, however, and the exact symbol of this 

 form must remain in doubt. 



