METEORITES OF NORTH AMERICA. 75 



several years the stone remained where the Bohemian had left it until he sold the land, when he removed it to his own 

 farm, believing that it might be valuable metal. Mr. H. Hensoldt, a teacher near the place, found it here and disposed 

 of it to Ward and Howell. 



The stone showed well-marked pittings but the crust appeared only in the deeper depressions; the freshly fractured 

 surface shows, besides the grains of metal, a greenish-gray appearance not unlike some greenstones. A particularly 

 interesting feature of the mass was the presence of a few dark-colored veins varying greatly in dimensions. 



The stone measured 58 by 46 by 28 cm., and its total weight was about 146 kg. It had a roughly rounded shape. 

 Specific gravity, 3.510. 



Analysis by Whitfield: 



SiOj 37. 70 



Fe 3.47 



FeO 23. 82 



A1A 2. 17 



PA 0.25 



CaO 2. 20 



MnO .' 0. 45 



MgO 25.94 



NiO 1 . 59 



Ni 0.65 



CoO 0. 16 



Co 0.09 



S... 1.30 . 



99.79 

 Less O for S... 0.65 



99.14 



The stony portion is described by Merrill * as consisting of olivine and enstatite, with 

 considerable pyrrhotite. 



It has a chondritic structure which to the unaided eye is not distinctly marked, a fractured surface showing a 

 fine-grained and evidently a crystalline-granular rock, very compact, of a greenish gray color and thickly studded 

 with small metallic points with a brassy luster. A polished surface shows the stone to be composed of small chondri 

 rarely over 2 mm. in diameter, thickly and firmly compacted in a fine granular groundmass. Throughout the entire 

 mass are thickly distributed innumerable small irregular flecks of a steel-gray, brassy, and bronze-yellow color, pre- 

 sumably native iron and pyrrhotite. 



********* 



Thin sections show a confused aggregate of rounded and irregular, often fragmental olivine and enstatite grains 

 and chondri embedded in a fine granular groundmass of the same mineral composition. 



The chondri occur in monosomatic and polysomatic forms composed either of olivine or enstatite alone or the two 

 associated. Both are nearly colorless or gray on account of the inclosure of dust-like particles, and carry but few 

 cavities. Some augite or a closely allied pyroxene and traces of plagioclase occur. 



The metallic iron occurs in the usual rounded and irregular masses 1 to 2 mm. in diameter and in apparently equal 

 proportions with the pyrrhotite, which has a bright brassy luster in strong contrast with the silvery white iron. 



Newton noted that the metallic grains showed a tendency to an arrangement in lines 

 resembling Widmannstatten figures. 



Meunier 3 classified the meteorite as erxlebenite and calculated its composition as follows : 



Nickel-iron 7.21 



Pyrrhotite '. 2.84 



Olivine :. 38.01 



Pyroxenes (enstatite, etc.) 45. 23 



Feldspathic minerals, vitreous interstitial substances, products of altera- 

 tion 6.19 



Chromic iron, schreibersite traces 



99.44 



Specific gravity, 3.50 to 3.75; mean, 3.547. 

 **** 



The relative disposition of the constituent minerals, interpreted in the light of synthetic experiments, is as follows, 

 in the order of their concretion: 



First time. Pyroxenes and enstatite; feldspathic minerals. 



Second time. Peridotic powder filling the cavities left by the needles (aiguilles) of the preceding minerals. 



Third time. Very abundant vitreous magma, due to a later fusion of the primitive deposit. 



