No. 1.1 RESEARCHES ON METEORITES— MERRILL. 17 



A recalculation of these results gives the bulk or mass composition of the stone as follows: 



Per cent. 



Silica (SiOj) 38. 70 



Alumina (Al.Oj) 4.39 



Ferrous ojdde (FeO) IG. 406 



Manganous oxide (MnO) 336 



Nickel oxide (NiO) 204 



Lime(CaO) 1.939 



Magnesia (MgO) 26.018 



Chromic oxide (CrjOa) 482 



Metallic iron (Fe) 9. 724 



Metallic nickel (Ni) 1. 608 



Metallic cobalt (Co) 084 



99. 891 



No traces could be discovered of barium, strontium, zirconium, or potassium. 



(12) Meteoric stone, Ohondrite. Holbrook, Ariz. Described bj' Merrill." A gray ohon- 

 dritic stone, very fresh, having fallen on July 19, 1912. Contains veiy little metallic iron, but 



is correspondingly rich in sulphide. Analyses yielded: 



Per cent. 



Schreibersite 0. 11 



Troilite 7. 56 



Metal 4. 85 



Silicates 87. 48 



100.00 

 The metallic portion yielded : 



Per cent. 



Nickel 8.68 



Cobalt 64 



Copper .29 



Iron 90. 50 



100.11 

 The silicate portion vi elded: 



Per cent. 



Silica (SiOj) 41. 93 



Alumina ( ALOj) 4. 30 



Ferrous oxide (FeO) 21. 85 



Lime (CaO) 2.40 



Soda(Na20) Trace. 



M^nesia (MgO ) 29. 11 



Manganous oxide (Mn.0) .25 



Nickel oxide (NiO) 08 



99. 92 

 Specific gravity at 22.6° C, 3.48. 



None of the rarer elements under consideration were found, even in traces. The sulphide 



occurs in such forms as to be readily separated mechanically, and yielded on analysis: 



Per cent. 



Iron 63. 62 



Sulphur 36. 50 



Nickel, cobalt, and copper None. 



100.12 



This shows the mineral to be troilite, though its specific gravity (4.61) is low. It is, however, 

 wholly imattracted by the magnet, and apparently there is no question as to its true nature. 

 Its occurrence in this fomi is interesting in a stone so low in the metallic constituent. 



(13) Meteoric stone, Carbonaceous Chondrite (Cc). — Indarch, Elizabethpol, Russia. This 

 interesting stone fell, according to Meunier,'' on the 9th of April, 1891. Although made the sub- 

 ject of numerous brief papers, it seems never to have been previously analyzed, and was, there- 



a Smithsonian Muse. CoU. vol. 60, 1912, No. 2149. 6 Comptes Rendus, .Vcad. Scl., Paris, vol. 125, 1897, p. 894. 



21403°— 16 2 



