REPORT OF THE DIRECTOR I917 



177 



The chemical composition of the gray oolite is shown by analyses 

 1 and 2, for which, as well as for the remaining analyses, the writer 

 is indebted to the skill of Prof. E. W. Morley. 



The residue left from digestion in hydrochloric acid contained 

 much gelatinous silica which was subsequently dissolved in sodium 

 hydroxide, affording most of the soluble silica shown by the analyses. 





1 



2 





Sol. 



Insol. 



Sol. 



Insol. 



Si0 2 



M203 



9.20 

 8.31 

 1 .70 

 16.00 

 6.18 



9-25 

 0.06 

 0.07 

 4.41 

 0. 10 

 12.03 

 0.05 

 1.03 

 .00 

 0.29 

 0.00 



O.OI 



24.21 



0-39 

 4. 11 

 .00 

 0.06 

 0. 12 

 0.03 

 0.09 



.00 



0.15 



.00 



2.58 

 .00 



10.45 



10.03 



0.83 



18.41 

 5.60 



7-65 

 0.23 

 0. 14 



3-45 

 0. 12 



8-53 

 0.07 

 1 .42 



0.30 



O.OI 



0.09 



28.81 

 0.62 



Fe 2 3 



1 .40 

 .00 



FeO 



MgO 



0.07 

 .00 



CaO 



Na 2 



0.13 

 0.09 



K 2 



H 2 0+ 



H 2 0— 





C0 2 





Ti0 2 



0. 17 

 .00 



P 2 Os 



S 



1.05 

 .00 



MnO 



BaO 



SrO 









Less 



68.69 



0.64 

 68.05 



31-74 



67-33 



32.34 

















100.43 



99.67 



SiOssol. inHCl 



0.28 





0.38 









1 Chamosite oolite, Burns farm, Clinton, N. Y. Princeton Catalog, no. 6070. 

 E. W. Morley, analyst 



2 Chamosite oolite, Burns farm, Clinton, N. Y. Princeton Catalog, no. 6108. 

 E. W. Morley, analyst. 



The large amount of insoluble material is what would be antici- 

 pated from a comparison of the gray oolite with the ordinary oolitic 

 iron ore, and its composition is also what would be expected — 

 essentially quartz, of detrital origin, and pyrite, formed in situ. 



It is, however, the soluble portion which is of chief present interest 



