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Agate is a very fine grained form of Quartz, it grows within volcanic lava bubbles known as geodes. Diamond saws are used to slice the Agate, it's then ground to remove any imperfections. It's then polished and dyed to enhance and display the beautiful natural banding within. Most Agate comes from Brazil.
This is a popular size of Agate slice and is perfect to make into a coaster by adding a felt or cork backing to protect surfaces from the dye. You can find our full range of Agate slice sizes here.