Curious Minds Did You Know? Agate is a common rock formation made up primarily of chalcedony and quartz!
The slices of agate you see are slices of a geode. Geodes look quite plain on the outside, but when they are broken open often contain simply beautiful crystals. Geodes form in the bubbles in volcanoes and it takes hundreds of millions of years to grow.
The most common crystal is quartz and amethyst - a lilac to purple variety of the crystal - is the most popular to collect.
Once the geode fills with crystals, we can then slice it into beautiful pieces which can be polished for a beautiful display piece.