A fine grained granite, sample 03MW2621 is
comprised of quartz (30%), K-feldspar (30%), plagioclase (28%), biotite
(5%), epidote (2%), chlorite (2%), sphene (1%), oxides (1%), and
muscovite (1%). Fine grained quartz is present throughout the sample.
Some porphyries of K-feldspar are present, showing minor plagioclase and
quartz inclusions. Plagioclase occurs in finer, severely altered grains.
Rounded quartz aggregates may be relict feldspar phenocrysts. Very dark,
pleochroic biotite occurs in up to 2-mm bundles and is replaced by
chlorite in some places. A weak foliation is defined only by micas.