234 J. P. Cooke on Stibiotrizincyle and Stibiobizincyle. 
Stibiotrizincyle. 
It can be obtained by melting together 58 p. c. of commercial 
antimony and 42 p. c. of zinc, and allowing the liquid mass 
when thoroughly melted together, to cool until a crust forms on 
the surface, On piercing through this crust and turning out the 
generally over an inch in length. They tend however to form 
compound crystals with parallel major axes which are often several 
inches in length and a quarter of an inch in diameter. Naturally 
they present a silver white color and a beautiful metallic lustre. 
The surfaces are often however iridescent, owing to a slight 
_ oxydation, and the true color is then only seen on the fracture. 
p- Gr. of crystals = 6-48, Homer. 
Their form is that of a rhombic prism, with sometimes only 
one, but generally with both sets of edges truncated. A section 
through the lateral axes is given below with the angles between 
the planes of the prism. The crystals invariably, so far as I have 
observed, run out to fine points, and although I have examined 
many hundreds of these crystals, I have never seen one witha 
termination. 
I on i? = 148° 30’ 1. 
I on 72 = 121° 30’ 
I on I over ¢7 = 1179 
I have observed variations from the angles 
given above on crystals of the same crystalli- 
zation amounting to ten minutes. The an 
gles given measured the same to a minute on 
crystals from three different crystallizations, and are therefore fe 
garded as the most probable. é 
I 
-~ 
= 
it 
found 
on analysis to correspond very closely to Sb Znz. Of three anal- 
yses made by myself of crystals from different erystallizate 
c 
en 
either the zine or the antimony found and that required ae 
3, and 4 give the results of the three analyses just mentione?: 
