297 



^ e. RaCEMIC CIS-DlAMINO-DIETHYhENEDlAMINE-COBALTI-NlTRATE. 



Beautiful, well-developed, 

 yellow-brown or red-brown py- 

 ramids, with lustrous faces. They 

 are nicely built, and have very 

 constant angular values. 



Ehombic-bipyramidal. 

 a'.b:c = 0,9473 : 1 : 0,6758. 



Fig. 5. 



cis-Diamino-dielhylenediamine-Cobalti- 



Nitrate. 



Forms observed: o = [l'J-l]> 

 with highly lustrous faces. The external form of the crystals is that 

 of flattened octahedra. 



Angles: Observed: Calculated: 



o:0 =(lll):(nr)=* 91° 0' — 



o:o =(lll):(in)=* 61 11 - 



0:0 =(111):(111)= 57 48 



(111) 



(111)^ 



89 2 



57°38' 

 89 



No distinct cleavage was observed. 



§ 7. RaCEMIC CIS-DlNlTRO-DlETHYLENEDIAMINE-CoBALTI-NlTRATE. 



(i'^avo-salts). 



"IS !"«'■'■ 



Small, flattened, yellow-red prismatic crystals. They are identical 

 with those previously measured M by us, which we had received 

 from Werner, but they have other combination-forms, and somewhat 

 deviating angular values. The aspect of the crystals is tiiat of fig. 20 

 in the paper mentioned. 



Mono clinic -prismatic, 

 a: 6:c — 1,5589: I : 0,4073. 



/S = 68°30v;. 



All forms previously observed were met with again ; their relative 

 development was also almost the same, only q = [Oil] was appre- 

 ciably larger here. New forms are: r = [401], well developed and 

 yielding good reflexes; and .9=:[410J, very narrow, but lustrous. 



Angles: Observed: Calculated: 



m:m = (110):(TlO)=* 110°50' 

 c:r =(001): (401)=* 57 36 — 



1) F. M. Jaeger, Zeits. f. Kryst. u. Miner. 39. 564. (1904). 

 Proceedings Royal Acad. Amsterdam. Vol. XX 



20 



