5G 



JOURNAL OF THE 



rally mistaken for zircons, suctli was their almost perfect resem- 

 l)lancein color and form. The l>est sing-le crystal was only one- 

 fourth inch wide and one-half inch long, though a polysynthetic 

 grouping of several crystals was double that size. The particular 

 feature was the long prismatic development (zircon-like) and the 

 transparency of the crystals. Careful measurements showed the 

 inclination of the unit pyramid on the prisn) to l)e 131^ 12^ to 

 131° 14'. Density 4.52. They added one new plane to the 

 species, the pyramid 3 (331). A notable crystal was .121 and 

 .113 inch in its two diameters and .522 inch long. It was per- 

 fectly transparent and of a hair-brown color. A small mineral- 

 ogical gem could have l>een cut from it. 



Lately I have re-examined the monazite-sand obtained in 

 August, 1880, near Miliiolland's Mill (now Warren's), on Third 

 Creek, Alexander county, and have identified this rare mineral 

 in it. The crystals are very n;kinute, but are perfectly clear, 

 have a delicate brown tint and have long prismatic develop- 

 ment. They also present one neio })lane, i. e., pyramid 2 of the 

 second series. I have descrii)ed (.Tvstals from Burke countv*' 

 (Mills') and from Fienderson county (I)avis' on Green River) 

 that were symmetrically compounded with zircon, like those 

 from Norway first noticed by Zschau. (Amer. Jour. Sci., II, 

 XX, 273). 



PRISiMATIC XENOTIME AND XENOTIME-CYRTOLITE (SYMMETRICALLY COM- 

 BINED) FROM ALEXANDER AND HENDERSON COUNTIES. 



MoNAZiTE (cerium, lanthanum and didymiun) phosphate 

 with some thorium). — The crystals of this species which I was 



*Lately found to coutain over 4 per cent, of tliori:^. 



