Palmer — Arizonite, Ferric Metatitanate. 353 



Art. XXXY. — Arizonite, Ferric Metatitanate ;* by Chase 



Palmer. 



The mineral, which is the subject of this paper, was found 

 on a mining claim belonging to Mr. A. Gr. Aim, about 25 miles 

 sontheast of the railroad station at Hackberry, Arizona. It 

 was received at the U. S. Geological Survey by Mr. Frank L. 

 Hess, along with some gadolinite, of which the new mineral 

 was suspected to be a variety. The prevailing rock in the 

 locality of the find is granite. The new mineral occurs together 

 with typical gadolinite in a pegmatite dike. The gadolinite 

 gelatinizes with hydrochloric acid ; has a specific gravity 4*28 ; 

 and a partial analysis shows that it contains : 



Silica (Si0 2 ) _ 24*41 per cent. 



Yttria earths... _ 36*86 " " 



Ceria earths 11*50 " " 



Beryllia (BeO) 11-50 " " \ 



Ferrous oxide (FeO) 11-56 " " 



/ 



95-83 



a 



The new mineral occurs for the most part in irregular 

 masses outwardly resembling the gadolinite with which it is 



Fig. 1. 



p^o 





a 



c'X * ei 



associated. The weathered surfaces of the two minerals, how- 

 ever, differ, those of the new mineral being somewhat lighter, 

 in color inclining to grey. The vitreous appearance of fracture 

 surfaces of the gadolinite, moreover, is wanting in the new 

 mineral. 



One specimen showed crystalline form. This was referred 

 to Dr. F. E. Wright, who has very kindly furnished the fol- 

 lowing preliminary crystallographic description of the mineral : 



" For the crystallographic examination and determination of 

 this mineral only one large and imperfectly formed crystal 

 was available (fig. 1, actual size, side view). Its faces were 

 rounded and unequally developed, and the crystal angles could 



* Published by permission of the Director of the U. S. Geological Survey. 



