Composition:

Petrographic Description:  The groundmass is glassy, microlitic and 
spherulitic.  The phenocrysts consist of sanidine > plagioclase (oligoclase in 
part) > biotite > quartz.  Accessories are apatite and magnetite.

Microprobe Analysis:  None.

Chemical Analysis:
SiO2  70.87
CaO  1.58
TiO2  trace
Na2O  3.47
Al2O3  15.18
K2O  5.04
Fe2O3  2.18
H2O  1.08
FeO  0.12
P2O5  trace
MnO  trace
MgO  0.6
TOTAL  100.12
