For wide spans, supports should be added so glass doesn't sag. Tempered glass is stronger, but is rarely used in furniture because it must be cast rather than cut to size. All glass edges should be polished and rounded to eliminate sharp, hazardous edges. Glass can be carefully drilled, cut and hinged, usually by stabilizing it in a frame or retaining device. Mirrors should be selected and treated the same as glass.
Marble is the most common stone for furniture.
It tends to shatter less than glass but also tends to break along veining lines. Travertine marble is extremely porous. It generally is filled and polished before it is used for furniture. Some granite and slate also are used in furniture and are stronger than marble. Construction All case goods should be constructed to hold up to their intended use.