30 



JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 11, NO. 2 



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largely on the difference in 

 their chemical composition, 

 but an examination of the 

 analyses and molecular 

 ratios of the two as shown 

 in tables i and 2 casts some 

 doubt on this distinction, 

 especially as the analysis of 

 caryopilite is reported to 

 have been made on mate- 

 rial not entirely pure. ^ The 

 analyses of caryopilite show 

 somewhat less silicate and 

 somewhat more water and 

 for the bases higher MnO 

 and correspondingly lower 

 FeO than the bementite. 

 The bementite from Frank- 

 lin Furnace carries con- 

 siderable zinc. The optical 

 and other physical proper- 

 ties of the two minerals as 

 seen in table 4 show con- 

 clusively their identity. 

 The bementite from Frank- 

 lin Furnace is said to be 

 soft, and the caryopilite is 

 said to have a hardness of 

 3 to 3.5, while the massive 

 bementite from Washington 

 has a hardness of about 6. 

 The low hardness of the 

 first two may be only ap- 

 parent and due to the friable 

 character of the material. 

 In view of the close similar- 

 ity in other optical proper- 

 ties, the somewhat lower in- 



^ Quoted, Dana: System of min- 

 eralogy, p. 704. 



