AKT. 21 A METEORITE FROM FORKSVILLE, VA. — MERRILL 3 



The soluble silicate gav^e the following: 



Per cent 



SiOj 29. 10 



AI2O3 .43 



FeO .-- - 34.04 



CaO .44 



MgO 32. 97 



NiO .30 



S> .- 2. 16 



P265 -43 



Total 99.87 



The insoluble silicate was found to have the following composition: 



Per cent 



SiOa 00. 89 



Al,03 - -- ---- 6.78 



FeO 10.79 



CaO 2.70 



MgO 2L72 



NiO ^O"^'- 



CrOj -22 



MnO Trace. 



NaaO 1-21 



K2O ^4 



Total 99. 9o 



The composition in terms of the meteorite as a whole is: 



Per cH^iit 



Si02 38.10 



AUO3 3.00 



FeO 22. 35 



CaO l-3o 



MgO 26.25 



NiO • 16 



CrOa -09 



MnO Trace. 



Na^O -49 



K2O -26 



P.O5 -23 



Fe ' ^-66 



Co 0*1 



Ni. -"8 



Cu -005 



S - 114 



Total 99.960 



Concerning the methods employed in these analyses, Mr. Shannon 



says: 



Fragments of the .stoae, tree from crust, to the weight of 32 grams, were 

 ground to pass a 12-nvesh screen. This sample was thoroughly mixed and a 

 5-gram portion was ground to pass 80 mesh, and all magnetic particles were 

 removed from it by repeatedly working over the sample with a hand magnet. 



1 Due doubUoss to admised troilita. 



