Agate is one of the world's most-prized minerals. It is a micro-crystalline variety of quartz and is typically formed in volcanic rock. Its natural hardness makes it perfect for jewelry, carvings, bookends, coasters and clocks. Our magnificent Agate Slabs feature high quality and hand-polished Brazilian stone. Due to the characteristics of the natural stone, slices may vary in color, pattern and size (7" - 8"). Slabs make great gifts for men and women and are perfect additions to everyone's home decor.