346 Turner — Unusual Minerals from the Pacific States. 



Analysis of Vesuvianite No. 186. 



Si0 2 . 

 A1.0, 

 FeO . 



*xo 3 



MgO 



CaO . 



Gkorge Steiger, analyst. 



Na 2 ) 



K 2 \ " 



H 2 0- 



H 2 + 1 



Ti0 2 _ ___ 



C0 2 -_- 



PA - -- 



so„ 



80 

 53 

 56 

 27 

 23 

 00 



13 



CI... 

 F ... 

 MnO 

 BaO. 



10 

 56 

 66 

 05 

 07 

 none 

 none 



Less O 



•48 

 none 



99-92 

 •36 



99-56 



investigated. The nearest railroad station is Luning. Some 

 of this material is said to have been used as a pigment for 

 paint at the Midwinter Fair in San Francisco. The mineral 

 was examined by Dr. W. F. Hillebrand, who made the follow- 

 ing report : 



"The mineral is a basic sulphate of sodium and ferric iron 

 which if freed from foreign matter might agree in formula 

 with jarosite. This is a potassium salt of formula 



K 2 03Fe 2 3 4rS0 3 6H 2 0, or written structurally 

 [S0 4 ] 2 [Fe /// (OH) 2 ] 3 K, since the water is constitutional, 

 not being expelled below redness." 



"The pure crystallized sodium salt does not seem to have 

 been heretofore observed. The mineral contains a small frac- 

 tion of a per cent of potassium with nearly 6 per cent of 

 sodium." 



Nickel minerals. 



About three miles from Candelaria, Nevada, east of the road 

 to Columbus, is a nickel deposit. Specimens sent b} r Mr. 

 A. C. Dwelle were examined by Mr. E. T. Allen, of the Geo- 

 logical Survey, who found a sulph-arsenide of nickel, perhaps 

 gersdorffite, and a green hydrous magnesian silicate genthite, 

 present. 



