W. E. Ridden — Mineralogical Notes. 255 



Jarosite, from the Jarilla Mts., Doila Ana Co., New Mexico. 



On the " Shoo-ah-me " (the Peublo Indian name for tur- 

 qnois) Mining Claim, situated in the Silver Hills District in 

 the above described region, there are several outcrops of limo- 

 nite, which at no great depths, change to pyritiferous copper 

 ore. At one of these the crystals of jarosite here referred to, 

 were found in comparative abundance though small and unsat- 

 isfactory. Prof. Peniield kindly tested some of them and 

 found them to contain Fe 2 3 , S0 3 , H 2 and K 2 0, but none 

 were found smooth enough for measurments. The forms pre- 

 sented were apparently c, 0001 ; /*, 1011 and s, 0221. They 

 occur as druses of bright Drown crystals having curved faces. 

 It is interesting to add that a fine quality of turquois was being 

 mined less than three rods from where the jarosite was found. 



Green Xe?iotime, from the Rrindletown Gold district of Burke 

 County, North Carolina. 



This variety of xenotime occurs as a rare constituent of the 

 auriferous gravels of the region named. It has not as yet been 

 found there in situ. The common condition is that of opaque 

 rough crystals, having quite perfect prismatic cleavage, of a 

 gray-brown color and a low degree of hardness. Rarely, the 

 crystals exceed a gram in weight and exceptionally some of 

 quite perfect form over two centimeters in diameter have been 

 found. Even larger groupings, of a polysynthetic character, 

 have been found near the head of Brindle Creek on the land 

 belonging to J. C. Mills just opposite Pilot Mountain. 



It was in the interior of some of the larger crystals that the 

 new green variety was found. From its irregular position, 

 within the brown opaque crystals, it seems evident that the 

 green portion represents the original condition and the brown 

 is an alteration product, due to hydration, oxidation, etc. The 

 new material, which is of a bottle-green shade, is transparent 

 to translucent and has a bright vitreous luster. When finely 

 pulverized it is soluble in hot hydrochloric acid, which feature 

 is new to the species. It goes readily into solution (excepting 

 the Si0 2 ) when boiled with concentrated sulphuric acid in 

 platinum and to the resulting paste sufficient water is added. 



Through the kindness of Prof. F. W. Clarke, of the U. S. 

 Geol. Survey, I am enabled to add here analyses by Mr. L. G. 

 Eakins, of both the green xenotime and of the brown alteration 

 product. In conjunction with these an analysis by Blomstrand 

 of a similar xenotime found at barest o in Norway* is added 

 for sake of comparison. 



* See Dana's System Min , 6th edition, p. 749. 



