Mallet — Stony Meteorite from Goon Butte, Arizona. 355 



This shows an excess of silica over that required for the 

 orthosilicate of between 4 and 5 per cent, suggesting the pos- 

 sibility of a little free silica being present, perhaps as the 

 asmanite (tridymite) of Maskelyne. That form of silica, it is 

 stated, is soluble in a boiling solution of sodium carbonate in 

 water, and as such a solution was used to take up the silica set 

 free by the action of hydrochloric acid, it would be found and 

 counted in with that of the olivine. 



Enstatite was calculated from the results of analysis of the 

 portion left by the magnet and not decomposed by Irydro- 

 chloric acid, deducting the minute quantity of chromite and such 

 of the constituents of the so-called maskelynite as occurred in 

 this portion. The figures so obtained give the following per- 

 centage composition for the enstatite — 



SiO„ 53-87 



MgO 26-55 



FeO -. 18'35 



98-77 



showing a very fair accordance with the results of calculation 

 from the formula of the mineral. 



University of Virginia, 

 Feb. 3, 1906. 



Am. Jour. Sci. — Fourth Series, Vol. XXI, No. 125. — Mat, 1906. 

 25 



