Lithology      Rhyolite
Sample#        AP-938-91
Chemistry
SiO2           76.90
Al2O3          12.10
Fe             2.00
CaO            0.10
TiO2           0.14
MnO            0.02
K2O            3.49
MgO            0.40
Na2O           3.67
P2O5           0.02
PPC            1.20
X-Ray Diffraction
               Quartz, Plagioclase
               Mica
               Chlorite
