Agate is a type of chalcedony, which is a type of quartz with microscopic-sized crystals.
The formation of agate is incredibly complex and has never been studied in real-time. Many questions remain unanswered about the exact process.
Agate can be exceptionally colourful but also commonly occurs in black, white, and grey. The colours and patterns come from impurities of other minerals.
Many different types of agate exist, and the most popular varieties often have their own name.
Agate stones, both rough and polished are popular with rock and mineral collectors. It's also widely used for its healing properties.
