10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



agreement with the calculated norm, except for the presence of 10.8 

 percent feldspar in the norm. Only a small amount of feldspar actually 

 was observed, and most of this component is evidently in the devitri- 

 fied glass. 



The composition of the Cynthiana meteorite shows that it is an 

 olivine-hypersthene chondrite in Prior's classification (1920). The total 

 iron content, 19.2 percent, places it in the low-iron (L) group of Urey 

 and Craig (1953). This iron content is considerably less than the 

 average (22.33 percent) for Urey and Craig's L group, and suggests 

 the assignment of this meteorite to Keil and Fredriksson's (1964) LL 

 subgroup (low iron-low metal). The metal content, however, is not 

 unusually low for an L group chondrite, and the iron content of the 

 olivine is not as high as in those chondrites classified as LL group by 

 Keil and Fredriksson. 



