What is this close-up picture? (WotsThat: Volcanic ash texture (macro))

Question

What object is shown in this zoomed-in close-up photo?

FeldsparGhost · Accepted Answer

Volcanic ash texture (macro). Volcanic ash isn't soft like wood ash; it's made of tiny jagged fragments of rock and glass, which is exactly why it's so abrasive and damaging to aircraft engines and machinery.

Answer: Volcanic ash texture (macro)

More natural phenomenon close-ups