Across Europe, the stone industry generates millions of tonnes of granite sludge every year; a fine, wet waste left over from cutting and polishing stone. Today, most of this material is stored in large ponds that occupy land, risk contaminating soil and water, and offer no value back to local communities. At the same time, the construction sector still depends heavily on energy-intensive, clay-based products that require high-temperature firing and the extraction of virgin r

The Green transition is typically understood as a transition in the type of resources we use. Perhaps the most known “green” practices...