A set of two natural Brazilian agate bookends with luminous blue tones. Agate is formed from volcanic rock containing sparkling crystals and minerals. One piece of agate is sliced in two to create a pair of bookends. Their rough exterior contrasts with the rich, highly polished interior of intricate bands of color and stunning geological details. A wonderful way to add an organic element to a modern or traditional décor. As useful as they are beautiful, they make a timeless addition to a room.