( 136 ) 

 8. 1-2-4-6-Trinitrophenylmethylnitramine. 



C«H . (NO,) . (NOJ . (NOJ . N (NOJ (CH,) ; m. p.: 127° C. 



(6) (4) (2) (1) 



The compound is obtained from benzene -|- acetone in the shape 

 of small, very strongly refracting, pale sherry-coloured needles, which 

 possess a strong lustre and are, geometrically, very well built. 



a 



Fig. 10. 



Monoclino prismatic. 



«:^,:c= 2,7823:1: 3,5242. 

 /?=75°31i'. 



Forms observed : c = jOOlj, most strongly developed of all ; 

 rt = |100| and r=:fi01|, both strongly reflecting; ^-^JOIII some- 

 what more opaque. 



Measured : Calculated : 



a'.c = (100) 

 a : r = (fOO) 

 c:q=z (001) 

 c:r= {001) 



q:q = (Oil) 

 a:q = (100) 



(001) = * 75° 3n 

 (lOl) = * 43 36è 

 (Oil) =: * 73 40 

 (Ï01) = 60 53 

 (011)= 32 32 

 (011)= 85 54 



60° 53' 

 32 40 



85 58è 



A distinct cleavability was not found. 



Optical axial plane is |010| ; on |001| one axis is placed nearly 

 perpendicular. The double refraction is moderate and negative; 

 extraordinarily great dispersion with q"^ v. 



The sp. gr. of the little crystals is: :1,570, at 19°; the equivalent 

 volume = Ü 82,16. 



Topical axes ; / •• V' : w = 7,4485 : 2,6772 : 9,4347, 



