Figure 6.
A grayscale micrograph showing mineral structures with cracks, voids, and a diverse texture. Features include angular fragments and various mineral shapes, indicating geological processes.The image depicts a grayscale micrograph capturing mineral structures at a microscopic level. Various textures are visible, characterized by angular fragments and cracks creating voids within the material. The arrangement includes interspersed areas of differing mineral shapes, illustrating geological processes. Notable features include well-defined boundaries between minerals. The scale bar at the bottom indicates a dimension of fifty micrometres, providing context for the size of the structures observed.

A broom-like crack filled with multiple ASG intrusions from an andesite particle (lower right). Darker regions indicate lower calcium/silicon ratios, representing the fluid initial ASG (Kawabata et al., 2024). The large black areas in the right lower and middle positions of ASG filling crack are voids

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