260 



INDIUM AND THALLIUM IN 



Occasionally there was a tabular development on |101j. 

 On only one crystal was the form jlOOj found. No cases of 

 twinning were observed. 



(NH 4 ) 2 InBr,s H 2 

 FIG. 12 



The crystals were colourless, and relatively insoluble in 

 water. They were as a rule small, badly formed, and gave 

 multiple, indefinite reflections. From the various crops which 

 were grown, it was found difficult to obtain a sufficiently 

 large number of crystals capable of yielding fairly reliable 

 results. The crystals of this salt are distinctly poorer than 

 those of any other member of the series. 



System : Rhombic bipyramidal. 



Axial constants : a : b : c='9841 : 1 : T4033. 



Forms present : jlOlj, jOllj. 



JlOOj on one crystal. 

 S. G.=3-350 at 20. 



