248 



Calculated: 



51^ 

 60 



20' 

 O 



on m they are orange- 



Angles: Observed: 



c:r =(0001) : (1011) = * 38° 40' 

 r:m = (1011) : (1010)= 51 20 

 m:m = (lOTO) : (0110) ^ 60 



No distinct cleavabililj was observed. 



The crystals show a feeble dichroism 

 yellow for vibrations parallel to the c-axis, and lemon-yellow for 

 such as are perpendicular to that direction. Opticallj' uniaxial, occasion- 

 ally with disturbed interference-image. The character of birefringence 

 is negative as it was in the cases of the Co-, and R/w-ssdts. 



§ 5. Laevogyhate Tri-f.thylenediamine-khodium- 

 -chloro-d-tartrate. 



I 1 ^'^ 



\l-Rho {Eine), -{- -LH.O. 



Beautiful, rather big colourless and parallelogram-shaped plates 

 or short prisms. They are well developed and possess constant 

 angular values. 



MonocUnic, and having apparently prismatic symmetry. Of the 

 facets of and to commonly only three, e.g. io^, o^ and o^, are present. 

 rt:/;:c = 0,9158: 1:0,6965; 

 1^=1 72° 357/. 



Forms observefl: m = jHOj, well developed, commonly predominant 

 with two parallel faces and having high lustre; c = !001|, large and 

 also perfectly reflecting; a)=:|lll|, larger than = 1111}, both 

 rather dull and giving weak reflections. The crystals are plates parallel 

 to |110|, with a slight elongation in the direction of the c-axis. 



m„ 



m, 



.'K 



Kig. 4. 

 1-Tri-ethylenediamine-rhodium-chloro-d-tartrates. 



