Crumbly, Shiny Lava
This is a good example of the sometimes collapse-y pahoehoe that one can encounter on Mauna Loa. There is a small lava tube within this lava, and you see that a chunk of it has broken away under my footstep (roughly middle of picture).
This image is from the presentation "A Hawaiian Kaleidoscope - Mauna Loa Climb via Observatory Trail - Supplemental Images".

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