The Virtual Rock Kit -

Rock 2: Metatuff

This rock is composed of clay- to sand-sized particles of volcanic ash that have been hardened into rock.  A rock composed of ash is called a tuff.  This rock has been metamorphosed and is called a metatuff.

Individual grains are not easily visible in this rock. The rock is composed of small grains of hardened volcanic ash.

The rock is an extrusive igneous rock that has been metamorphosed.


When the surface of the rock is wet, individual grains can be seen. Each gain is a piece of volcanic ash.

metatuff - wet

Please remember that rock and mineral collecting is STRICTLY PROHIBITTED on protected land!



Want to learn more about the geology of the Eno River area?

You may be interested in A Geologic Adventure Along the Eno River - A richly illustrated publication from the North Carolina Geological Survey.