HANDBOOK OP THE METEORITE COLLECTIONS. 69 



quantities of troilite, nickel-iron, magnetite glass, and maskelynite. 

 Chemical composition (analysis recalculated in part) : 



Per cent. 



Iron (Fe) 0.57 



Nickel and cobalt (Ni and Co) -17 



Ferrous sulphide (FeS) 9-48 



Silica (SiOs) 42.55 



Ferrous oxide (FeO) 17.13 



Alumina (AI2O3) 2.23 



Lime (CaO) 1-01 



Magnesia (MgO) 20.14 



Potash and soda (K2O and Na^O) .12 



99. 40 



Reference. — E. Artini and G. Melzi, Esplorazione Commerciale, 



December, 1898. 



ESTACADO, CROSBY COTTNTY, TEXAS. Nos. 372, 462. 



Stone, Cka. Polished slab 26 by 38 cm., weighing 5.45 kilograms, 

 or 12 pounds, and slab weighing 476 grams. Weight of original 

 mass, about 290 kilograms, or 638 pounds, and hence exceeding in 

 size any Imown stony meteorites. Found in 1883 and supposed to 

 have fallen the year previous. Composition as shown by Davison's 

 analysis : 



Per cent. 



Iron (Fe) 14. G8 



Nickel (Ni) 1.60 



Cobalt (Co) .08 



Copper (Cu) Trace. 



Carbon (C) found, but not determined. 



Sulphur (S) • 1.37 



Phosphorus (P) .15 . 



Silica (SiOz) 35.82 



Ferrous oxide (FeO) 15. .53 



Magnesia (MgO) 22.74 



Lime (CaO) 2.99 



Alumina (AI2OS) 3.00 



Soda (Na.O) 2.07 



Potash (K2O) .32 



Titanic oxide (TiOa) found, but not determined. 

 Chromic oxide (CrjOs) found, but not determined. 

 Manganous oxide (MnO) found, but not determined. 



100. 95 

 Less O for S . 68 



100. 27 



The mineral composition was found to be : Metallic, 16.41 ; silicates, 

 83.59, being mainly olivine and enstatite. Chromite and pyrrhotite 

 are also present in small quantities. 



