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Tuff

A volcanic rock, deriving from magma. The loose fragments, if less than 2 mm in diameter, are called ash. When the ash is consolidated and cemented into rock it is called tuff. The Egyptian word bxn may include this stone: see too siltstone

 

UC6189

Aston/Harrell/Shaw 2000: 60-62
Aston 1994: 26-27


 

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