326 Hidden and Pratt — Twinned Crystals of Zircon. 



purple etched fragments; quartz crystals; ilmenite, in minute 

 grains (rare) ; small octahedrons of magnetite ; orthoclase ; 

 massive garnet; parallel growths of auerlite upon unaltered 

 gray and brown zircon ; very good crystallized green epidote ; 

 allanite in masses, as large as 50 pounds; well crystallized 

 brown sphene. most of the crystals are altered to xarithitane ; 

 and vermiculites with broad folise often four to six inches in 

 diameter. 



The thanks of the writers are due to Mr. Freeman, who 

 generously presented the crystals used in the preparation of 

 this paper. 



