216 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



It is a mass of great apparent homogeneity, weighing originally about 50 kg. One of the sections, however, on 

 being polished discloses a nodule about 1 cm. in diameter, like troilite in appearance, which remains to be investigated. 

 A polished surface of the meteorite etched with nitric acid' developed very handsome Widmannstatten figures, some- 

 what like those on the iron from Robertson County, Tennessee. 



Meunier 3 described the iron as a heterogeneous one showing many black particles. 

 Brezina 4 described the Vienna specimen as f oUows : 



This mass shows the most marked grouping of the lamellae into bundles of any iron yet observed. Bands 0.3 mm. 

 wide, long and straight, somewhat puffy, kamacite medium fine, somewhat lightly hatched and grained; taenite 

 normally developed; fields now abundant, and now inconsiderable, filled with gray, half blended, fine repeating 

 lamellae, occasionally giving the appearance of staining or spotting. Reichenbach lamellae are abundant and surrounded 

 by borders of kamacite. On one. piece a globule of troilite 12 mm. in size was noticed, with a border of kamacite 1 mm. 

 in thickness which showed a tongue of iron projecting into the interior of the troilite to a depth of 2 mm. There is also 

 a zone of alteration along the natural surface 0.2 to 0.5 mm. wide, which runs quite even on the inside despite the 

 wavy character of the outer surface. 



Cohen 6 essentially repeats the characteristics given by Brezina as follows : 



The bands are long, straight, somewhat puffy, usually bunched and then strongly, the taenite borders are not very 

 prominent, the fields are well developed and distinctly marked off from the lamellae. The kamacite, slightly granular 

 in places, shows many sharp etching lines and appears under very strong magnification to be exceptionally finely 

 punctate, apparently in consequence of tiny, closely and evenly distributed etching pits. It also exhibits a strong 

 oriented luster. The smaller fields consist of compact very dark plessite with tiny glistening scales. In the more 

 extended fields the latter are larger (0.005 mm. in diameter with limits of 0.003 and 0.01 mm.) and while they are so 

 arranged that the stripes which intersect one another appear now darker and now brighter it appears under the glass as 

 though such fields were composed of bands; under stronger magnification it becomes apparent that this is not the case, 

 since the stripes are in no way distinguishable from one another. These are probably Brezina's "gray, half shaded, 

 fine repeating lamellae." Occasionally there occurs in such a field a complete lamella about 0.04 mm. thick, isolated 

 in such a way that a union with the large bands and their taenite envelope is at least not perceptible, or else the field is 

 traversed by a bundle of such lamellae whose taenite envelope then, however, differs from the principal taenite. 



Grand Rapids belongs to the few meteorites which take on no permanent magnetism. Leick determined the 

 specific gravity at 7.8862 and the specific magnetism at 0.12 absolute units per gram. 



The meteorite is distributed. 



BIBLIOGRAPHY. 



1. 1884: Eastman. A new meteorite. Amer. Journ. Sci., 3d ser., vol. 28, pp. 299-300. (Analysis.) 



2. 1885: Riggs. The Grand Rapids meteorite. Amer. Journ. Sci., 3d ser., vol. 30, p. 312. (Analysis.) 



3. 1893: Meunier. Revision des fers m6t&>riques, p. 76. 



4. 1895: Brezina. Wiener Sammlung, p. 270. 



5. 1895: Cohen. Meteoreisen-Studien IV. Ann. K. K. Naturhist. Hofmus. Wien, Bd. 10. pp. 83. 84, 85, and 90. 



6. 1905: Cohen. Meteoritenkunde, Heft III, pp. 368-370. 



Green County. See Babbs Mill. 



GREENBRIER COUNTY. 



Summit of Alleghany Mountains, 3 miles west of White Sulphur Springs, West Virginia. 



Here also Alleghany Mountains and White Sulphur Springs. 



Latitude 37° 49' N., longitude 80° 26' W. 



Iron. Coarse octahedrite (Og), of Brezina. 



Found about 1880; mentioned 18S5 or earlier in a London catalogue; described 1887. 



Weight about 5 kgs. (11 lbs.). 



The meteorite has been chiefly described by Fletcher, 2 as follows: 



A single fragment of iron having an estimated weight of 11 pounds was found about the year 1840, on or near the 

 top of Alleghany Mountains, 3 miles north of White Sulphur Springs, Greenbrier County, not far from the eastern border 

 of West Virginia (latitude 37° 51' N., longitude 80° 20' W.). The finder, and his official agent, thinking it a rich 

 piece of iron ore, searched unsuccessfully for a vein. The specimen itself was taken to a country blacksmith, heated, 

 and cut with a cold chisel, and pieces distributed as specimens of iron ore. Some time afterwards two of them, 

 weighing 63 and 31 ounces, were given by the agent to Mr. Matthew A. Miller, C. E., of Richmond, Virginia. Con- 

 vinced of their meteoric origin, he immediately tried to recover the pieces already distributed, but after traveling 

 several hundred miles, he was forced to the conclusion that they were irrevocably lost. From Mr. Miller the two 

 pieces were acquired for the British Museum. 



