HANDBOOK OF THE METEORITE COLLECTIONS. 115 



MOUNT JOY, ADAMS COUNTY, PENNSYLVANIA. Nos. 160, 213, 356. 



Iron, Hb. Several pieces weighing 135, 1,330, and 1,765 grams, from 

 a mass weighing 383.5 kilograms, found in 1887. No record of fall. 

 The iron contains so much lawrencite (iron protochloride) that it de- 

 composes rapidly on exposure. An analysis by W. Tassin yielded : 



Per cent. 



Iron (Pe) 93.80 



Nickel (Ni) 4.81 



Cobalt (Co) .51 



Copper (Cu) .005 



Phosphorus (P) .19 



Sulphur ( S ) . 01 



99.325 



Gifts of Edward E. Howell and Jacob Snyder. 



Reference. — E. E, Howell, Amer. Journ. Sci., vol. 44, 1892, p. 415. 



MOUNT VERNON, CHRISTIAN COUNTY, KENTUCKY. No, 300. 



Stony-iron, Pallasite. Nearly complete individual, polished on one 

 face, weighing 288 pounds, or 130.6 kilograms (pis. 27 and 28). 

 Found many years ago but its meteoric origin not recognized until 

 1902. Complete analyses not available owing to the coarse nature of 

 crystallization. Mineral composition has been estimated as follows: 



Per cent. 



Olivine 6.3. 15 



Nickel-iron 33. 12 



Schreibersite 1. 95 



Troilite . 69 



Chromito 1. 00 



Carbon . 09 



Chlorine, abundant traces ; not determined. 



100. 00 



The nickel-iron alloy approximates one-third of the mass. Etching 

 shows it to be made up of a dark colored alloy in which are fine lines 

 of a tin- white color (see pis. 27 and 28), which are in part oriented 

 with and in part penetrate the mass in zigzag shapes. Bounding 

 this is a band of bright, white iron, which varies in width from a 

 line to a millimeter. 



Examined under the glass the mass of the iron appears to be made 

 up of minute octahedrons arranged in fine lamellae, and considered as 

 a unit may be defined as a granular octahedrite containing more or less 

 troilite and schreibersite areas. 



