Cinder

A cinder is a pyroclastic material. Cinders are extrusive igneous rocks; they are fragments of solidified lava. Cinders are typically brown, black, or red depending on chemical composition and weathering. Cinders are similar to pumice.

Example of a cinder, found at Amboy Crater
Volcanic eruptions such as this one can create cinders.
Volcanic cinder in the Mount Cayley volcanic field, British Columbia, Canada

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