Tuff

About it

Rock of compacted volcanic ash, often light and soft, with bits of pumice, crystals, and rock fragments. The moai of Easter Island and the cave homes of Cappadocia, Turkey, are carved from tuff.

Type

Rock (igneous)

Group

Igneous (pyroclastic)

Lustre

dull, earthy

Colours

white, cream, grey, pink, yellow, tan, green

Transparency

opaque

Typical values: real specimens vary. For more, see mindat.org.