6J 



VTT. Df:vtrO(^yratory Lu.fi'o-TrielJnjIeni'diaminr-Cohaltinltrate, 



Formula: \Co {Aeiv),\{N< >,),. 



This ('ümpouiid was prepared iii perfectly analogous way to the 

 left-handed isonieride. From its acpieous solutions it crystallises as 

 dark red, very large crystals with rectangular outlines. They are 

 also very beautifully developed and give sharp images; the habit 

 as well as the limiting planes are quite analogous to those of the 

 laevogyratory component, but the crystals were in general not so 

 strangely distorted, and they had somewhat smaller dimensions. They 

 are the complete mirror-images of the crystals previously described. 



Rhoinbic-bisphenoidic. 



n:b:c = 0.8652 : 1 : 0.6009. 



Observed Forms: a = {100\ and 7?i=:|lJ0{, both reflecting very well; 

 in is somewhat more largely developed than a, and the crystals 

 usually appear flattened parallel to two opposite faces of {110}. 

 Further-on: ?' = |101j, well developed, and like t> =: |lllj, giving very 

 sharp images; .s'^{211j, small and showing in most cases only two 

 faces; q=:\011\, very small; p = \V20\ and 6 = |010!, extremely 

 narrow and reflecting badly, often absent (fig. 8). 



Angular Valueg; Observed: Calculated: 



a :mr:=(100):(llÜ)=r*40° 52' — 



o :?«r=(lTl):(lT0) = *47 26 — 



« :,. =(100):(lTl)=n 59 18 59° 14' 



r : w ==(101):(1]0) = 64 ;n 64 26^ 



rt :r — (100) :(101) = 55 14 55 13 



„ : J' =(ni):(10l)= 26 32 26 25 



w:?« = (110) :(lTO)= 98 14 98 12 



)• -.r =(101) :(T01)= 69 31 69 34 



/, :s =(010): (211)= 70 37 70 39^ 



o -.0 =(lTl) :(Tllj = 85 8 85 5 



»/,:,; =(llo):((»T I) = 70 10 70 13^ 



»■ :*; =(1(T) :(0ir)= 45 20 45 7 



/H:p =(110):(r20) = 18 55 19 Oi 



h :p ={in0):(l20)= 30 30 1^ 



i :m ^ (010) :(110)= 49 4 49 8 



?) :o =(0T0):(lTl)= 63 40 63 44 



