% 



No. 2184. PLAINVIEW (TEXAS) METEORITES— MERRILL. 421 



Silicates : 



Silica (SiOj) 35.31 



Ferric oxide (Fe^Oa) 2. 95 



Chromic oxide (CrjOa) 34 



Alumina ( AUOs) 2. 70 



Ferrous oxide (FeO) 15. 13 



Manganous oxide (MnO) 18 



Lime(CaO) 1.43 



Magnesia (MgO) 24. 69 



Nickel oxide (NiO) 77 



Cobalt oxide (CoO) 003 



Soda(Na^O) 76 



Potash (K2O) 12 



Chlorine (CI) not det. 



Total 100.173 



The phosphorus, although determined in the soluble metallic por- 

 tions, is in part present as a phosphate, as already noted, the chro- 

 mium is present as chromite, while the troilite is calculated from the 

 3.48 per cent of sulphur found. 



The texture of the stone is firm and the chondrules in large part 

 break with the matrix. The ground in the fresh, unoxidized portion 

 is crystalline, though in places doubtfully fragmental. I have classed 

 it provisionally as a spherical chondrite (Cc). It will be known as the 

 Plainview meteorite. The second largest mass, weighing 1,915 grams, 

 is in the collections of the Field Museum of Natural History, Chicago. 

 (See Addendum below.) 



EXPLANATION OF PLATES. 

 Plate 34. 



The Plainview, Texas, meteorites. Cat. No. 521. 

 Fig. 1. The 1,320-gram stone as received. 



2. The largest single individual of the Plainview meteorites, weighing 3,450 

 grams. The view shows the brustseite with radiations extending outward 

 in all directions from the large thumb markings in the upper central portion 

 of the figure. 



Plate 35. 

 Plainview meteorites, second find. 



No. 1, 863 grams; No. 2, 2,527 grams; No. 3, 2,940 grams; No. 4, 4,592 grams; and 

 No. 5, 5,585 grams. 



ADDENDUM. 



Since the above was written five more stones have been received, which Mr. Right- 

 mire reports as having been found 2 miles west of those first discovered. These, 

 as shown on plate 35, weigh, respectively, 863, 2,527, 2,940, 4,592, and 5,585 grams. 

 Of these, No. 4 is of principal interest, showing areas of primary incrustation only at a 

 few points, aa at the lower extremity of the figure. The remaining surfaces show 

 secondary incrustations over more recent fractures. Numbers 2, 3, and 5 are fairly 

 complete individuals, though showing also secondary crusts over limited areas. Thin 

 sections prepared from several individuals were at first thought to present structural 



