Lithology      Rhyolite
Sample#        AP-936-186
Chemistry
SiO2           74.08
Al2O3          13.08
Fe             2.99
CaO            0.88
TiO2           0.40
MnO            0.02
K2O            1.60
MgO            0.33
Na2O           4.88
P2O5           0.12
PPC            1.61
X-Ray Diffraction
               Quartz
               Plagioclase
               Mica
               Chlorite
