NO.13S0. PERSIMMON CREEK METEORITE— TA.s.sJX. 959 



CARBON. 



Before burnin^^- the carbon it was examined under the niirroseope 

 for diamond and elit'tonite, without tindino- either of these minerals. 



thp: acid soluble ToHTIoX. 



The solution w^as evaporated to di yness, taken up with stronj,' nitric 

 acid, aoain evaporated to dehydrate any silica present, rcnlissolved, 

 tiltered, the filtrate again evaporated and taken up Avitii a few drops 

 of nitrie acid and hot water. This solution was now made up to 1,000 

 cc. with cold water and proportional parts analyzed. 



The separation of the iron and nicked was effected l»y the succinate 

 method, experience having- shown that if the conditions here noted are 

 observed it is quicker than the acetate method, and a complete sepa- 

 ration is g-enerally effected on the first precipitation and always (^)n the 

 second, Avhile with the acetate method at least three precipitations are 

 necessary and often more. The procedure is as follows: 



Add iimmonia slowly and with stirring to th*^ dilute nitric acid solu- 

 tion till the color is a red brown. Should the solution become turbid, 

 add a drop of acid to clear it. Then add a 3(i per cent solution of 

 sodium acetate, to which a drop or two of acetic acid has been added, 

 till the color is deep red (an excess of sodium acetate does no harm). 

 Then precipitate at the temperature of the "water l)ath with sodiiuu or 

 ammonium succinate, using 'dl grams of the succinate for every gram 

 of iron present; more than this dissolves the precipitate unless til- 

 tered cold. When the precipitate has settled, filter, wash with cold 

 water, and then with Avarm water, carrying 2() per cent of anunonia. 

 The filtrate is then concentrated and the nickel cobalt contents deter- 

 mined as the operator pleases. 



An analysis of the solution gave: 



Iron 94. 360 



Nickel :^. 723 



Cobalt 250 



Copper 290 



]\Ianganet-e 010 



Phosphorus 270 



Silica 809 



Aluniinu Trace. 



riatiiuiin Trace. 



^[agiiesiuiii Trace. 



The phosphorus contents may have been derived from dissolved 

 schreibersite, or from an unknown phosphide, or from phosphorus in 

 solid solution analogous to the conditions prevailing in certain manu- 

 factured irons, though nietallographic methods have failed to develop 

 anything that would warrant the last two assumptions. The silica 

 and magnesia were derived from the olivine. The platinum, alumina, 

 and magnesia contents were too small to weigii, aiul the first two may 

 have been admitted during the analvsis. 



