58 



Rhombic- pyramidal. 



r/ :/>: c = 0.8079 : 1 : 1,1279. 



Observed forms -. o =: {112!, large and lustrous; a = |1()0{. smaller, 

 hut also giving beautiful images; //;:=|120!, almost equally well 

 developed as o, sometimes even with yet larger faces ; p = !120j, 

 appreciably smaller than ?//, but very lustrous; i =r j010| narrow; 

 c^jOOlj commonly absent, but if present well developed and giving good 

 images; to:=jll2j, with very small but lustrous faces; a' = jlOOj 

 almost in every case absent, but sometimes present as a very narrow 

 blunting of the intersection (120): (120). The crystals possess com- 

 monly a very peculiar irregularly-tetraliedrical habit, with prominent 

 faces of and in. 



Fig. 6. 

 Racemic Triethylenediamine-Gobaltinitrate. 



Angular Values : Observed : 



a:o =(100):(112)=z *58° 42' 

 o:o =(112):(lT2)=:*49 38 

 o:o =(112): (112)= 96 

 o:m = (ir2):("20)= 85 

 o:p =(112): (120)= 50 

 i:OT = (010):(r20)= 81 

 «:/> =(100): (120)= 58 

 p:p =(120) :(l"o)= 116 

 m: 1,1 — {\20) : {v'O) =116 

 o: u> = (00l).(ll2) = 41 

 w: w = (Tr2) : ("12) = 49 



Calculated : 



