Tuff - an igneous rock of explosive volcanic eruptions.

Tuff is an extrusive igneous rock that forms from the tephra ejected during explosive volcanic eruptions.

For use in exercises in igneous rock classification. EISCO Volcanic Tuff Specimen (Igneous Rock) is formed by ash and dust deposited during explosive

Eisco™ Volcanic Tuff Specimen (Igneous Rock)

File:Cougar Point Welded Ash-Flow Tuff (Miocene, 10.5-12.5 Ma; near Grasmere, Idaho, USA) 1.jpg - Wikimedia Commons

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Tuff: Close-up of a piece of tuff exposed at Hole-in-the-Wall, Mojave National Preserve, California. This specimen clearly display…

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File:Welded Tuff from Western USA.jpg - Wikimedia Commons

Tuff - an igneous rock of explosive volcanic eruptions.