66 



Antimony is with it in the form of hairs and spiculae, and 

 the crystals are composed of, as it were, bundles of fibres, 

 making a more or less complete modification, and accumu- 

 lating in whorls or in crosses : see the right and left hand 

 figures. The signs of the primitive cube are distinctly seen 

 upon the ends of the groups, and the reverse of the same 

 figure; but it is difficult to see the primitive fracture, as, al- 

 though they have a loose appearance, they are so incorporated 

 that they fracture most like a compact glassy substance, 

 conchoidally and irregularly. We however had the luck to 

 find one fractured face which may agree with the Count's 

 ideas. We have in this therefore the cubic sign of the 

 primitive with the edges bevilled at an angle of 150° on the 

 upper face, and of ] 20° on the prism, nearly as the Count 

 de Bournon observes. 



TAB. CXXXVI. 



irom the purity of these specimens, which were lent me 

 by Mr. Richard Phillips, resulted a most perfect analysis by 

 Mr. Hatchett, who has determined the proportion of the 

 substances in it : and the largeness of the crystals has been 

 the cause of Count de Bournon's determining the primitive 

 crystal and modifications, which is so difficult, as he ob- 

 serves, from the irregularity of their increase. The primitive, 

 as he remarks, is a rectangular tetraedral prism, which has 

 its terminal faces perpendicular to its axis. Thus it is a 

 sort of cube, and from observation on my specimen (see 

 tab. 135.) I find the integrant molecule may be a triedral 

 prism, four of which make a cube. 



