andesite of Mount Shasta, Califomia, 1 is em ie Felix and aLenk* | 
‘ X } 
SiO, TiO, Al, O, Fe, 0. FeO MnO CaO “Mgo K,0: war0! POF “Hy Os ‘Sp.Gre , 
J. 61.06 trace 15.42 8.01 Wonotdet. wien sl aaertk ae ee ae eo 2.66 - trace 0.68 — ak s ie 
A14°62.00 ~' 0,975. 5.37;54 woes 440 trace §=6§.37 2.64 1.47 ‘4.29 0.29 ~= 1.66 
*O%. cit. p. 100. 

