295 



Angles: Observed Calculated: 



«:m^ (100): (110)=* 48°10' — 

 r'2:m = (\0ï):(\l0)=* 67 15 



r'2:^ =(T01):(0I1)=' 52 14 - 



m:m=^(110):(Tl0)= 83 40 83°40' 



q:q = (Oil) : (OTi) =^ 79 13 79 13 



r'2:q =(T01):(0Tl)= 52 14 52 14 



r, : 7, =(101): (011)= 51 23'/o 51231/2 



r, :m = (101):(110)= 65 48 65 51 



m:<" = (TlO) : (T2I) = 32 19 32 23 



'^' :q =(121): (011)= 27 52 28 1 



The crystals are distinctly c^avable parallel to [110]. Thej are 

 slightly dichroitic, analogously to the iodide. The angle of extinction 

 also, about 20° with respect to the c-axis on m, has a size also 

 comparable with that found in the case of the iodide. 



^ 4. Racemic crs-DiAMiNo- 



DIETHYLENEDIAMINE-COBALTl-IODIDK 



[Eine)^ 



Big, splendidly developed, brown-red and 

 highly lustrous crystals with very constant 

 angular values. 



Monoclinic-prismatic. 



r?: 6 :cr= 1,0975:1 : 0,8178; 



^==:87°28V3' 



Form.<i observed: ?«=: [110], predominant and 

 very lustrous; <7 =: [100], smaller than m; 

 qz= [Oil], large and sharply reflecting; r, ==: [101] 

 and r\ = [101], almost equally well-developed 

 and yielding excellent reflexes; c>^[121], and 

 to = [121], almost equally large and wel 



Co 



h + ^H,0. 



fig. 3 



reflecting. The habit is prismatic parallel to Racern.c cis-Diamino-di- 

 " ' '^ etnylenediamine cobalti- 



the c-axis. ' iodide. 



