Lithology      Rhyolite
Sample#        AP-938-226
Chemistry
SiO2           77.73
Al2O3          11.88
Fe             1.56
CaO            0.92
TiO2           0.10
MnO            0.02
K2O            2.65
MgO            0.10
Na2O           4.45
P2O5           0.03
PPC            0.60
X-Ray Diffraction
               Quartz
               Plagioclase, Potassium Feldspar
               Mica
