i 7 8 



NEW YORK STATE MUSEUM 



and here, again, in spite of the somewhat heterogeneous nature of 

 the material analysed, the results are what had been anticipated. 

 A proper interpretation of these results involves a simple recalcula- 

 tion, the phosphorous being treated as Ca 3 (P04)2, the calcium 

 and magnesium as carbonates, and the ferric oxide as disseminated 

 hematite. Si0 2 , A1 2 3 , FeO, remaining MgO and the H 2 0"are then 

 recalculated to ioo per cent, giving the results shown in 1a and 2a 

 below. 





(38.84%) 



2a * 

 (4441%) 



3 



4 



5 



6 



7 



■8 



9 



Si0 2 



AU03. . .. 



Fe 2 3 .. . . 



23.68 

 21.39 



23-53 

 22.58 



25.19 

 19-74 



22.28 



25.46 



0.96 



37-41 

 3.12 

 0.31 



25-23 

 19.97 



37-51 

 4-39 



21-35 

 17.70 



H-57 

 36.81 



3 90 



30-49 



23-52 

 36.92 



48.95 

 7.66 



23 -43 

 1.32 



2-97 

 •57 

 .98 



9-54 

 4-93 



50.85 

 8.92 



24.40 

 1.66 



3.13 

 1 .26 



FeO 



MgO 



CaO 



41 .21 

 2-37 



41.46 

 4.66 



41-45 

 1.49 



Na 2 















0.25 

 4.21 

 5-55 



K2O 

















H2O+. .. 

 H2O— . ... 



H-35 



. 7-77 



12.13 



10.25 



12 .90 



8.78 



9.07 



MnO 









0.21 











tr. 























100.00 



100.00 



100.00 



100.00 



100.00 



IOO. II 



100.00 



100.35 



100.23 



1 a Chamosite of gray oolite, Burns farm, Clinton, N. Y. Princeton Catalog, 

 no. 6070. E. W. Morley, analyst. 



2a Chamosite of gray oolite, Burns farm, Clinton, N. Y. Princeton Catalog, 

 no. 6108. E. W. Morley, analyst. 



3 Chamosite, Schmiedefeld. Mean of two analyses recalculated to 100. 

 Zalinski, Neues Jahrb. f. Min. etc., B. B. XIX, p. 77, 1904. 



4 Chamosite, Wabana, N. F. Recalculated to 100. Hayes, Memoir y8, Geol. 

 Survey of Canada, p. 59, 1915. 



5 Chamosite, Windgallen. Recalculated to 100. C. Schmidt, quoted by 

 Zalinski, Op. cit., p. 78. 



6 Thuringite, Gebersreuth. Zalinski, Op. cit., p. 73. 



7 Greenalite, Mesabi. Anal, by Steiger, recalculated to 100. Leith, C. K., 

 The Mesabi Iron Bearing District, Mon. 43, U. S. Geol. Survey, p. 246, 1903. 



8 Glauconite, Padi, Russia. K. Glinka, Zeits. Kryst. Min. XXX, p. 390, 

 1899. 



9 Glauconite, Station 164B, Challenger Expedition. Thomson, C. W. & 

 Murray, J. Report of Challenger Expedition, Deep-Sea Deposits, p. 387, 1891. 



In view of the variable character of the rock analysed and the 

 large amount of material calculated out, these figures, in spite 

 of some lack of agreement, are in sufficient accord to justify 

 conclusions as to the nature of the mineral composing the shells of 

 the spherules, and it is, evidently, a hydrated, ferrous aluminous 

 silicate. Both its composition and its physical properties show that 

 the mineral is a member of the rather indefinite group of chlorites, 



