Examination of Alfianello Meteorite. 465 
The substance is finely granular, of ash-grey colour; a polished 
surface appears to be finely grained and breccia-form, with the 
elements offering different gradations of colour. Metallic grains are 
disseminated, and little nests are noticed, of iron with one of the 
compounds, of a yellowish-white or bronze. In one place where the 
metallic grains are numerous they appear to bear to the stony portion 
the ratio 68: 1000. The density of the stone is 3:47 to 3:50. 
The meteorite was dried at 120°, and treated with solution of 
mercury chloride, and thus there were dissolved the troilite and 
nickel-iron. The troilite constituted 6-919 per cent. of the meteorite, 
and the nickel-iron forms 2-108 of the stone, with the composition— 
ING Clee de Ne RSs ol see URE pate ory Aan PL Mgt ae (p 
TOM ee coe Skeeesctecwne oak RA gee es ceeiahos saints 28°795 
100-000 
_ Here, again, as I have shown in earlier analyses, the percentage 
of nickel present in nickel-iron increases as the percentage of nickel- 
iron becomes less. 
By long treatment with hydrogen chloride the silicates acted upon 
by that reagent and the silicates which resist the action were 
separated, and the stone appeared to possess the composition— 
PLEO TEC en ohak h gciciareiatee cinta Natsvion Rise ancien lk ae so a 6°919 
INitekel=ino Mira roe cels cet clon sec tucoce comet eneene Sal OS 
Solublevsilrca tes wens mcce eee ceiseee nas 50°857 
isolublersilvcatet acc. toe oscceceac aoe ehe ceece LOLS 
100-000 
The soluble silicate, which amounts to 50-857 per cent., and con- 
stitutes one-half the weight of the stone, consists of— 
Siicie acid 4ss.n ses ede as eae SHO) PA hy beet 18°73 
Toneproboxdd oe eo secct we sesia< Seas eeeeeecs 11°43 ) 
AN TOTTI a see sonee ea derer teats Tsai) akon: 0°707 16°37 
J LAOa) ae all a gaa a Mea ani AC LCST aly el 
MPA GMESTAVT AT, dlcsceicceshacs es UAE) |) edcbc 2°904 
99°98 
This olivine, which gives a green colour to a fragment of the rock 
that is at once recognized, is of unusual composition, containing as it 
does more than 50 per cent. of iron oxide. It agrees most closely 
with that which occurs in the meteorite of Ensisheim, the first 
recorded fall which has been preserved in any collection; it fell 
17th November, 1492. The latest analysis of that stone is by Frank 
Crook, of Baltimore, made in Gottingen in 1868, and he found in 
the soluble portion of that stone 52°90 per cent. of iron oxide. 
The insoluble portion, which forms 40°116 per cent. of the stone, 
has the composition — 
SHICT@IACI Cine Recess eeencencsaes SOTA emeacer 29°93 
Tron, protoxidey vec recsdeee ne ERO asics 2°97 
Chromium oid ersceeececcnee. Se2 Silden ass ae 11°05 
PulLinne ae S| Pn eer rae: ea 
Mapnesialcp-itecccerseese tte < W263 .5e 7°066 
102°174 
DECADE II.—VOL. X.—NO. X. 30 
