no. 2373. FERROANTHOPHYLLITE FROM IDAHO— SHANNON. 401 



the name eisenanthophyllite, which becomes iron anthophyllite in 

 English. The present writer prefers the form ferroanthophyllite as 

 the name for the iron end member of the anthophyllite group despite 

 the fact that the magnesium end member of the series will then 

 require the rather unwieldy name magnesioanthophyllite. This 

 nomenclature is in accord with that recently used by American 

 mineralogists to designate end members of isomorphous groups. 4 

 The group name anthophyllite will then indicate intermediate 

 mixtures of the two end members of the series, while the name gedrite 

 will continue to indicate important admixture of the aluminous 

 molecule. The possibility of occurrence of lime and of manganous 

 members of this series is remotely indicated. 



< See Wherry, E. T. (Bariohitchcockite, strontiohitchcockite, etc.), Proc. U. S. Nat. Mus., vol. 51, p. 

 83,1916; Schaller, W. T. (magnesiolud\vigite,ferroludwigite), Journ. Wash. Acad. Sei., vol.7, p. 29,1917, 

 and (manganoaxinite, ferroaxinite, etc.), Bull. U. S. Geol. Survey No. 490, p. 47, 1911. 



27177— 21— Proc.N.M.vol.59 26 



