ANALYSES OF MINERALS. 
In the following pages the analyses of over 180 mineral species are given; a con- 
siderable number of the species having been originally described as new by chemists 
connected with the Survey. These species are josephinite, cuprobismutite, warrenite, 
guitermanite, elpasolite, zunyite, ptilolite, hydronephelite, lucasite, antlerite, ienox- 
villite, redingtonite, plumbojarosite, emmonsite, powellite, morencite, coronadite, 
purpurite, goldfieldite, and arizonite. In other cases minerals which were im- 
perfectly described have been more sharply characterized and their true composition 
made known. Natrojarosite, for example, is here definitely recognized as a species. 
In general the order of Dana’s classification has been followed, but with some 
‘ small variations. Thus the tellurides are put in a group by themselves, the borosili- 
cates are brought together, while the phosphates, vanadates, and arsenates are given 
as three separate classes. On purely chemical grounds these changes are warranted; 
on morphological grounds the usual mineralogical classification may be better. 
I. NATIVE ELEMENTS. 
GOLD. 
From Persia; exact locality unknown. Analyzed by Charles Catlett. 
JOSEPHINITE. 
A nickel-iron alloy found in placer gravels in Jackson and Josephine counties, Ore- 
gon. Described as a new species by W. H. Melville, Am. Jour. Sci., 3d ser., vol. 43, 
1892, p. 509. Waterworn pebbles. Sp. er., 6.204. 
COs scste citsecceen e Silicates (anhydrous)..........-.......22.-- 12. 26 
SE passes b pe phasaeg eae S Nene gd al seo ed d H20 below 100° 
Pyrrhotite H20 above 100°.... 
Chromite........... aie Volatile matter... . 
Magnetite . CO Sais ensevsinun semoece.s powaaouereecemesdemers 
OW ssicz siete edad annonce 2 
ASiicrsie wince xt Ye acca erneis vcard cucibeeniee is 100. 55 
The silicate admixture, including the water, amounts to 13.38 per cent, of which 
12.88. per cent, soluble in hydrochloric acid, is serpentine. The ‘insoluble portion 
may be bronzite. Analyses of the silicates are as follows: 
Insolu- 
Soluble 
Total. | ble por- portion, 
33 -03 30 
2.08 04 2.04 
32 | trace 82 
1.62 06 1.56 
2.69 14 2.55 
08 |sceseens 08 
ITD lececgiess 1,12 
13. 38 50 12. 88 
