Lithology      Rhyolite
Sample#        AP-939-220a
Chemistry
SiO2           79.30
Al2O3          10.92
Fe             1.08
CaO            0.15
TiO2           0.09
MnO            0.01
K2O            5.71
MgO            0.28
Na2O           1.02
P2O5           0.02
PPC            1.40
X-Ray Diffraction
               Quartz
               Plagioclase, Potassium Feldspar
               Mica
