The least altered phase in this thin section is plagioclase, which forms roughly aligned, variably sized laths that make up both the groundmass, which is dominantly glass, and the phenocryst population. A second phenocryst, clinopyroxene, remains only as inclusions in the calcite pseudomorphs that replaced it. Vesicles, clays, and hematite pseudomorphs are abundant in this thin section.
The author has given permission for this work to be deposited in the Digital Archive of Colorado College.
The author has given permission for this work to be deposited in the Digital Archive of Colorado College.
