METEORITES OF NORTH AMERICA. 213 



For the solution of a piece weighing 17 gr. over 9 weeks were neceasary . These differences of behavior could be ascribed 

 not to chemical or structural distinctions, but to crystallographic orientation of the sections, causing in one case more 

 taenite and in the other case more kamacite to appear at the surface. The kamacite on treatment by acid became black, 

 and the acid worked especially rapidly on the swathing kamacite, which inclosed a great schreibersite crystal of which 

 a piece could be separated in sufficient quantity for a chemical investigation. The plessite was also soon attacked, 

 so that the combs became prominent after short treatment with the acid. 



I II III 



17.641 gr. 44.528 gr. 82.36 gr. 



WithlHCl+lOaq. WithlHCl+lOaq. With 1 HCl+20aq. 



gr- % gr- % gr. % 



Solution of nickel-iron 16.2971 92.38 40.5929 91.16 68.6063 83.30 



Taenite 0.8711 . 4.94 2.8506 6.40 3.5851 4.35 



Schreibersite '. 0.4728 2.68 1.0845 2.44 6.4808 7.87 



Swathing kamacite i 3.4711 4.22 



Rust 0.1537 0.18 



Carbon substance 0.0630 0.08 



17.6410 100.00 44.528 100.00 82.3600 100.00 



Numbers I and II left no marked carbonaceous residue, and as fhia was small in quantity in number III also it was 

 evident that Glorieta Mountain is relatively poor in carbon. The carbonaceous substance from number III after heating 

 and treatment with hydrochloric acid and sodium hydrate left only two to three angular, colorless, doubly refracting 

 grains. The schreibersite in number III, composed of 5.5 gr. of large crystals which were aggregated together, was 

 easily dissolved from the surrounding nickel-iron. Both lota of schreibersite were alike in physical properties. The 

 lack of jagged pieces indicated that the taenite lamellae lay close together, and hence longer treatment with acid was 

 required to separate them. 



Txnite. Especially characteristic of the taenite from Glorieta Mountain is the union of the foliae in bundles. After 

 the thin intermediate kamacite plates were completely dissolved out a skeleton remained about 4 mm. thick and 1.33 

 cm. long. The kamacite represented, therefore, only a very small surface of attack, and it was difficult, as in all the 

 other irons investigated by us, to obtain pure taenite. Even when the bundles seemed completely separated and small 

 leaves of about 0.15 mm. thickness isolated it was evident that many thin lamellae lay packed together. Through the 

 uneven, thin wavy surface the usual luster could be observed, also elasticity and color. 



The analyses of the material dissolved hi acid gave the figures under I. while in la the schreibersite corresponding 

 to the phosphorus is calculated : 



I la 



Substance taken 0.2563 



Fe 63.22 63.04 



Ni 35. 56 35. 53 



Co 1. 39 1. 43 



P 0.56 



Cu 0.00 



C.. Trace. 



100.73 100.00 



Schreibersite. For chemical investigation, the above-mentioned large crystals were chosen, the physical proper- 

 ties evidently being somewhat different from those of Toluca. They are brittle and almost without exception fall 

 apart on standing. The characters resemble those of bodies with strong tension, such as diamonds and bologna tears. 

 Any unaltered crystals were, therefore, not to be had. Where crystal faces appear they show little glancing facets, 

 like those of Toluca. Cleavage in three perpendicular directions is exhibited, with conchoidal fracture. One cleav- 

 age is like that of galena; the other two seem to be equal and somewhat less perfect than the first. The surface of the 

 crystals often seems finely striated and not so smooth as Toluca. Color, tin-white to gray, luster like to coal, streak 

 gray. 



The analysis gave : 



Substance taken 0.4086 



P 15.49 : 30. 96=0. 5003 =0.5003 



Fe.. . 63.36 : 55. 88=1. 1339] 



19 63 1 }= 1.4899 



123 1:58.60=0.3560[ 



99.71 



Fe : Xi (Co) : P=2. 2664 : 0.7116 : 1 

 Fe+Xi (Co) : P=2.9780 : 1 



Although the physical properties differ somewhat from the large schreibersite from Toluca, the chemical com- 

 position is so similar as to indicate two analyses of one and the same substance. 



