METEORITES OF NORTH AMERICA. 291 



Brezina 4 on account of their peculiar combination of brecciated and crystalline character- 

 istics would classify Richmond and Lumpkin together as a separate group under the name of 

 half-crystalline spherical chondrites (Cckb). 



The small amount of the meteorite known is distributed, Harvard possessing 61 grams. 



BIBLIOGRAPHY. 



1. 1870: Smith. Fall of a meteorite in Stewart County, Georgia. Amer. Journ. Sci., 2d ser., vol. 50, p. 293. 



2. 1870: Willet. Account of the fall of a meteoric stone in Stewart County, Georgia. Idem, pp. 335-338. 



3. 1870: Smith. Description and analysis of a meteoric stone that fell in Stewart County, Georgia (Stewart County 



Meteorite), on October 6, 1869. Idem, pp. 339-341. (Analysis.) 



4. 1885: Brezina. Wiener Sammlung, pp. 191 and 233. 



McKINNEY. 



Collin County, Texas. 



Latitude 33° 13' N., longitude 96° 35' W. 



Stone. Black chondrite (Cs) of Brezina. 



Described, 1895. 



Weight, two masses, the larger about 100 kgs. (220 lba.)- 



The only description published of this meteorite seems to have been by Brezina ' as follows: 



Mc Kinney is distinguished by the manifold variety of its chondri and its black luster, but, however, can not be 

 identified positively with the black chondrites, inasmuch as the black color is not certainly referable to a carbon content. 

 The principal part of the larger of the two stones discovered (weighing originally 100 kg.) has a weight of only 40 kg., 

 is semilenticular in form and shows the convex surface rough, pitted, and somewhat altered to limonite, and mostly 

 without recognizable fusion crust, except in traces in a very few places. Broken surfaces of the stone often follow 

 cleavage cracks, along which the formation of limonite has taken place, in some instances to the extent of forming 

 bright iron ocher flakes or layers. Near the surface, chips the size of a man's hand and from 1 to 15 mm. in thickness 

 may be pried off. The brittle, splintery character of the mass also frequently affords very thin, even chips. In many 

 places troilite accumulations in the form of quite irregular veins 0.5 to 1 cm. thick, traverse the stone, in which the 

 very abundant troilite takes the place of the very sparing nickel-iron. The termination of such troilite veins upon the 

 natural surface of the mass consists of pits 0.5 cm. deep from which the troilite has been melted out. Troilite nodules 

 as large as walnuts are also found, sometimes with, sometimes without accompanying troilite veins. Nickel iron occurs 

 only in quite isolated and rather abundant accumulations; in one instance, in a cavity 1 mm. in size, are found varie- 

 gated swollen hexahedrons of the same. The manifold variety of the chondri, some of which attain a diameter of 1.5 

 cm., is very great. The most abundant are leek-green to olive-green, of a dull to greasy luster in fracture, foliated or 

 (less frequently) monosomatic. These appear to consist of olivine; they blend occasionally with the groundmass, 

 are generally round, seldom flattened, have frequently a bright, sometimes jagged core, and a dark to greenish-black 

 shell, which is occasionally surrounded with a band of troilite, or more seldom with grains of iron. In the latter case 

 the iron appears also as interstitial matter in the interior of the chondrus. Besides these most numerous chondri there 

 appear also those which are bright yellow, dull, or of a slightly waxen luster; also greenish to wood-brown, radio-fibrous, 

 silken chondri in fragmentary form, and those which are bright pistachio-green, dull or slightly glistening to dark 

 pistachio- or blackish-green, brightly glistening; again some are black or blackish-green, eccentrically or parallel 

 rayed, beautifully glistening; and as rare exceptions those which are entirely black and lusterless. In one case there 

 is found a dull olive-green chondrus, 3 mm. in size and penetrated by a glistening lamella (or fault?). Very rarely 

 entire chondri of 1 to 2 mm. are to be found. 



The meteorite is distributed, Ward's 2 catalogue stating that his collection contains the 

 largest amount, 51,230 grams. 



bibliography. 



1. 1895: Brezina. Wiener Sammlung, pp. 252-253. 



2. 1904: Ward. Catalogue of the Ward-Coonley Collection, p. XII. 



Macon County. See Auburn. 

 Madison County. See Jewell Hill. 



