Extra Heavy Duty NATURAL AGATE COASTER - One #4 Size 4x4x.5" - Natural Color Polished Thick Agate Slice Geode Coaster Agate Coaster Slab from Brazil by GeoSpecimens Virtually Indestructible Heavy-Duty Agate Coaster Free Replacement Guarantee! (See Description) Makes a Great Display Piece or Coaster NATURAL Color Polished Thick Brazillian Agate