Tuff
1
Coin
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Tuff: It is a type of volcanic debris rock, composed of volcanic debris material with more than 50% of particles with a diameter less than 2 millimeters. The main component is volcanic ash, with a loose, rough or dense appearance. Layered tuff is called layered tuff; Due to different ingredients, the colors are diverse, including purple red, gray white, gray green, etc.
