Fine-Grained Categories of tuff:

• volcanic:material,
• volcanic:rock,
• igneous:rock,
• permeable:unit,
• lightweight:aggregate,
• brittle:rock,
• natural:material,
• natural:stone,
• porous:rock,
• sedimentary:rock,
• soft:rock,
• granular:rock,
• siliceous:rock,
• lightweight:material,
• natural:sorbent,
• crystalline:rock,
• basic:rock,
• soft:material,
• geological:material,
• artificial:material,
• extrusive:rock,
• volcanic:precursor,
• volcanic:sediment,
• consolidated:material,

Poetic Qualities of tuff: