Day #21 Deskcrop: Bread Crust-Textured Rhyolite

Today’s deskcrop is a small piece of rhyolite with a bread crust texture. The bread crust texture forms as an extrusive rock cools, and resembles (wait for it)… bread crust. I have a much larger piece, somewhat more pumiceous, from the same locality, but I’ll save that one for another day.

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Bread Crust-Textured Rhyolite