. 
- 
J. D. Whitney on Algerite and Apatite. . 209 
2. Apatite. 
The theoretical composition of apatite according to the latest 
a weights (Ca=250, C]=443:3, P=400, F=235-4) is as 
ollows : 
Ca C - Oa Ca Cl Ga? B 
Chlorine Apatite, 3°82 677 4127 4814; or 1059 89°41 
Ca Fl p Oa Ca Fl 6a? 
Fluorine Apatite, 3°94 872 42°62 49°72; or 766 92°34 
There has been a good deal of discussion as to whether the 
formula proposed by G. Rose was borne out by the analyses. 
Rammelsberg analyzed the fine crystallized apatite from the Zil- 
lerthal,* and endeavored to make a direct determination of the 
uorine. He only succeeded in obtaining about one-fourth of 
edges, 
of the phosphoric acid was effected by mercury, according to 
Rose’s process; in the other the lime was separated by means of 
Sulphuric acid and alcohol. The results were : 
co IL. 
Insoluble, - a - 029 =«- 0:25 
uime, as (ee60 = B83, 
Phosphoric acid, -  - 4328 - 43°17 
Chlorine, a - “ - 1:02 
mee ACE. es trace 
* Ramm. 2d Supp, p.15. + Pogg. 84,308. + Inaugural Dissertation, p. 44. 
Stoonp Sunies, Vol. XVII, No. 50.—March, 1854. oe 
