No. 2098. THE INDARCH, RU88IA, METEORIC STONE— MERRILL. Ill 



A recalculation of these analyses gives the following, showing the 

 composition of the stone as a whole : 



Per cent. 



Silica (SiOj) 35.699 



Alumina (AI2O3) 1. 969 



Ferrous oxide (FeO) 25. 790 



Manganous oxide (MnO) 0. 130 



Nickel oxide (NiO) 0. 549 



Cobalt oxide (CoO) 0. 049 



Lime (CaO) ', 1, 160 



Magnesia (MgO) 16.920 



Carbonic acid (CO2) 0. 271 



Phosphoric acid (P2O5) 0. 520 



Water (H2O) 2. 799 



Iron (metallic) (Fe) 10. 400 



Nickel (Ni) \ 0^949 



Cobalt (Co) 0.020 



Phosphorus (P) 0. 092 



Manganese (Mn) 119 



Carbon (graphite) (C) 0. 310 



Sulphur 5*100 



102. 846 

 Correction for 2 54 



100. 306 

 No barium, strontium, or zirconium could be detected. 

 The presence of water, though as a rule not expected, has before 

 been noted in carbonaceous meteorites and in the present case at 

 least is due to the oxidation and hydration of the sulphides and 

 perhaps small amount of lawrencite. The mineral composition so 

 far as determined by analysis and microscopic examination is: 



Silicate (enstatite) 74 42 



^^^^ -^''--;-;;;;;;;;;;; il5o 



T'-oil^t^-. 13.296 



Oldhamite ^ cq„ 



Graphite q oi 



„ ., 100.122 



Specific gravity o 49 



The stone is classed by Wiilfing as a carbonaceous chondrite (Kc). 

 Meunier places it in his Stawropolite Group. 



So far as the author at this moment recalls, oldhamite has up to 

 the present time been either found, or suspected to occur, in the 

 meteoric stones of Allegan, Bishopville, Busti, Hvittis, Indarch, and 

 St. Mark's. In the fu-st two its presence has been shown only by 

 chemical tests; in the other four its presence has as well been revealed 

 by the microscope. How prevalent it may be in other stones remains 

 to be seen and often much care and study must be devoted to its 



