Quartz and optically zoned phenocrysts. XP
Resorbed biotite phenocryst (relict biotite is present).
Altered glass appears brown. PPL
Plagioclase and esorbed biotite phenocryst (with relicts) set in an
intergranular groundmass. Al;tered glass is present.
Resorbed amphibole phenocryst. The shape indicates
it was originally amphibole (see the photomicrograph below this one).
Plagioclase phenocrysts exhibit at least two periods of resorption. PPL
Basal section of an amphibole phenocryst. Note the
characteristic 120˚/60˚ cleavage angle. PPL
Altered glass, bitotite, and partially resorbed
amphibole phenocrysts. PPL
