Figure 5.

Examples of glass (GL) found in O'ahu dust collectors deployed concurrent with the 2018 Kīlauea eruption. (a) A platy fragment with raised ridges separating adjacent vesicles. (b) Brown platy and smaller clear glass fragments. (c) Clear glass fragment exhibiting conchoidal fracture (red arrow). (d) Glass fragment with concave and convex edges. (e) Thin platy glass fragment and adjacent small ash particle. (f) Platy glass fragment. The presence of glass was verified by extinction under cross polarized light. Width of each photomicrograph is 300 μm.