Examples of inclusions inside vesicles and on outer surfaces of AH glass. (a) Photomicrograph of 3.9-mm fragment of broken meltglass dominated by a large vesicle. The red-brown color (arrow) indicates the lining of vesicle contains high Fe content. (b–f) SEM images of the inner walls of typical glass vesicles. (g) SEM image of flow textures (e.g., at arrow) inside a large vesicle. (h) Common crystalline textures inside glass vesicles formed as the molten glass cooled. (i) Central, cross-shaped, ~5.5-μm-wide embedded crystal composed of Ca, Mg, and Si. Based on SEM-EDS, it likely is a quenched, skeletal diopside crystal (CaMgSi2O6) within a glassy Ca-Al-Si matrix. (a,f,g) from level 457, sample E313, 413 cm depth. (b–e,h–i) from level 445, sample E301, 405 cm depth.