Lithology      Rhyolite
Sample#        AP-937-168
Chemistry
SiO2           74.99
Al2O3          13.52
Fe             1.43
CaO            1.08
TiO2           0.07
MnO            0.01
K2O            3.18
MgO            1.35
Na2O           1.13
P2O5           0.02
PPC            3.20
X-Ray Diffraction
               Quartz
               Plagioclase
               Mica
               (Vermiculite / Chlorite)
