please find enclosed two photomicrographs of thin sections from two different types of porous basaltic scoria from the Eifel in Germany. Maybe you can use it to compare.
Attached is a photomicrograph in plane polarized light of a sample collected from Oamaru on the South Island. These are from Surtseyan-style eruptions (so submarine explosive and different from what you're looking for) but you can see similarities in some of the vesicle morphology.