METEORITES OF NORTH AMERICA. 255 



a 11.5 kg. iron from Duel Hill found in 1873, and mentions the fact that about 1857 a mass weighing 18 kg. was dis- 

 covered at a distance of 1.5 km., which, however, was lost. Genth and Kerr 7 observe that the piece described by 

 Smith (3§ kg.) may possibly have come from the 18 kg. block which was apparently lost. According to Professor 

 Emerson, and from a photograph furnished by him, there are in the Amherst collection two specimens of 167.5 and 

 1,134 gr. which both belong to the octahedrites with fine lamellae. As there are now more than 3§ kg. from Jewell 

 Hill in collections, Burton's statement that one of the masses was lost seems to be an error. We must conclude, 

 therefore, that specimens from three masses are represented in collections, two of which (3$ kg. and 18 kg.) belong to 

 an octahedrite with fine lamellae and the third (11 J kg.) shpws coarse lamell a?. All three were found in the same local- 

 ity (formerly Jewell Hill, now Duel Hill). So long as no more definite information as to the place of discovery is to 

 be had, and it is not proved that one fall can yield two masses of such entirel y different structure, it seems most appro- 

 priate in order not to cause a new confusion, to retain both names; that is, to call the fine octahedrite Jewell Hill, the 

 coarse octahedrite Duel Hill. 



According to Smith, 1 the mass here indicated as Jewell Hill weighed 3§ kg., showed a few pittings upon the sur- 

 face and was covered with a thick coat of rust which continually exuded drops of iron chloride. Its analysis is given 

 below under I. 



Reichenbach 2 mentioned bronze-colored iron sulphide; Rose,' very fine Widmannstatten figures. 



Meunier * gave Jewell Hill as a typical example of plessite which is here mingled only with tsenite. Later," he 

 classed it together with La Grange and Biickeberg in a group. " Jewellite" (composed of like parts of tsenite and ples- 

 site); the very fine taenite lamellae of which intersect each other quite irregularly, are dull in the interior, shining at 

 the edges, and frequently form very characteristic combs. Schreibersite occurs in small particles; troilite is wanting. 



Tschermak 6 first observed the Reichenbach lamellae, which here attain a thickness of only 0.15 mm. He com- 

 pared them with those of Ilimae and noted in the case of both irons that the lines were oriented parallel to the planes 

 of a cube. 



Jewell Hill is distinguished from Tazewell, according to Sorby, in that it consists of three elements, one of which 

 may be schreibersite (taenite); both irons agree in original structure. 



The bands measure 0.17 mm. in width, are long and straight, and frequently have a finely jagged border. They are 

 very little swollen, seldom and then only weakly grouped, and entirely free from granulation. The taenite bands are 

 unusually broad, the fields not very large, but regular and prominent. The kamacite is throughout spotted-striped 

 and occasionally shows also line systems which look like file scratches. If it is actually bo, each band must be an 

 individual, and one can not even by the highest possible magnifying power detect anything that would indicate a 

 formation composed of grains; the flakes are in no way defined, but there appears now a fine flaming and now a finely 

 netted structure, as if there were tiny inclusions present. With stronger etching the kamacite becomes duller and 

 approximates the appearance of the plessite. A small portion of the fields consists of dense, almost black plessite; 

 under the microscope, however, it is shown nevertheless that they contain tiny glistening scales evenly distributed. 

 The larger portion of the fields is considerably brighter and, even under the magnifying glass, is shimmering, this being 

 occasioned by the fact that the highly glazed and here regularly distributed inclusions are larger and more numerous 

 than usual. They consist principally of bands 0.003 mm. in thickness, in the form of rods, hooks, or crooked frag- 

 ments, and a brighter or darker groundmass having the appearance of compact plessite. The structure, viewed under 

 a magnifying power of 220 diameters, resembles the micropegmatitic intergrowth of feldspar and quartz which I 

 have more fully described in connection with the Smiths Mountain meteorite, where the inclusions are not so fine as here. 

 Besides this, there often occur in considerable number glistening disks as much as 0.025 mm. in size, which appear to 

 be older than the micropegmatitic-like groundmass. These areas are occasionally intersected wholly or partially by 

 small, complete lamellae, which are branches of the principal lamellae of such a sort that the taenite seams run together 

 but not the bands. The quite regular distribution of the lamellae, which are seldom and then only slightly grouped, 

 as well as the predominance of the fields and the prominence of the taenite, cause the figures to be of the most beautiful 

 and regular varieties afforded by octahedral irons. 



Reichenbach lamellae are present in large numbers, as many as 30 having been counted on a section of about 20 

 sq. cm. They are almost always connected and are distinguished by extreme fineness. In the plate examined by 

 me they appeared, under 200 diameters enlargement, as mere threads, whose thickness scarcely exceeds 0.01 mm. 

 Tschermak 5 and Brezina IS give much larger dimensions. The swathing kamacite has an uneven border; it sometimes 

 attains the width of the bands, while in other places it is so constricted as to be discerned only under the microscope. 

 The small and somewhat abundant schreibersite grains lie exclusively in the bands and in the swathing kamacite. 

 According to Brezina, 13 the kamacite in the 2.5 mm. alteration zone is considerably more finely flaked than in the 

 interior of the iron. 



Analysis by Smith (I); by Burger (II): 



Fe Ni Co Cu Cr P S Residue 



1 91.12 7.82 0.43 trace 0.08 =99.45 



II 88.78 9.90 0.81 0.02 trace 0.13 0.13 trace =99.67 



Jewell Hill takes on fairly strong permanent magnetism; the specific magnetism was determined by Leick as 

 2.35 absolute units per gram. 



The meteorite is distributed, but having been much confused with Duel Hill it is impos- 

 sible to determine from catalogues how much of Jewell Hill is actually in collections. Wulfing 

 unites the two. 



