The stained-glass style made from thick glass slabs set in a rigid matrix is called dalle de verre.
Dalle de verre uses slabs of colored glass, usually much thicker than traditional window glass. Artisans cut or fracture the slabs and set them into a matrix such as epoxy resin or cement. The thickness and broken edges can produce strong color and sparkle when light passes through the material.
The technique became especially prominent in twentieth-century Europe and was used by artists and architects seeking bold, abstract effects. Unlike traditional leaded glass, where narrow lead strips join many relatively thin pieces, dalle de verre relies on a substantial structural setting between the glass units.
The French term literally refers to “glass slab.” It is sometimes loosely called slab glass, but dalle de verre is the standard specialist name. It should not be confused with pâte de verre, which is a casting process using powdered glass.