hypertufa means an anthropic rock made from aggregates bonded with Portland cement, intended as a substitute for natural tufa.
Etymology
From hyper- + tufa.
noun
- An anthropic rock made from aggregates bonded with Portland cement, intended as a substitute for natural tufa.“There are weight restrictions on rooftops and terraces, of course, and fiberglass is a lot lighter than tufa, the limestone rock used in alpine gardens, or the mix of cement, peat and sand that makes up hypertufa, the artificial stone used for troughs.”