Figure F7. Photomicrograph and whole slide image of a glassy chilled pillow margin displaying a transition from holohyaline to spherulitic texture (Sample 327-U1362A-2R-2 [Piece 17, 121–126 cm]). A. Concentric and radial cooling cracks partially filled with saponite (thin section = 25 mm wide). B. Transition from fresh amber glass to glass with abundant fibrous spherulites (FOV = 4.5 mm; plane-polarized light). Orientation of the photomicrograph is shown by a red arrow.
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