GREY SHIMMER COMPOSITE QUARTZGrey Shimmer Composite Quartz is an amazing grey slab with numerous specks and flecks which almost looks dense and perfect for contemporary styled kitchens. Grey Shimmer Quartz is a scintillating grey Quartz with white spotting grains and spots. Composition: Binders and additives often make up the remaining 10 to 15 percent of the material, with Quartz typically accounting for 90 to 95 percent of it. Thickness: 20MM, 30MM Finish: Polished, Velluto.