11 
TAB. CCVI. 
C A LX phosphata. 
Phosphate* of Lime. 
Div. 1. Crystallized. 
$$ 
Tuts specimen shows some of the varieties in the trunca- 
tions and bevillings of the hexaédral prism, from the alter- 
nately truncated edges—see the upper geometrical figure— 
to the more complicated—see the lower figure. 
The gangue is commonly talcose, with Oxide of Tin and 
with Quartz, sometimes with Fluor, Felspar, and rarely 
white Topaz, as in this specimen. 
The prevalent quantity of Talc often gives it a waxy ap- 
pearance, and this is peculiar to this rock, which, thus 
differing from the general appearance of rocks, has been 
supposed to be, and even sold for, Apatite itself. 
Apatite has been confounded with Beryl by the Chemist 
Trommsdorf, who thought it to contain a new earth, which 
he named Augustite, but this is now understood to be an error. 
* Phosphorus is sometimes united artificially with Lime, forming a powder, 
which, if put into water, sinks to the bottom, but soon decomposes the water 
by taking up part of its oxygen, and freeing part of the hydrogen: the 
phosphorus becomes inflamed; and while this decomposition is taking place, 
flames burst forth through the water till the phosphorus is consumed. 
