Geodes are hollow mineral matter structures within certain rocks. They are commonly lined by minerals such as crystal and quartz. Bristol Diamonds, quartz crystals in geodes found in the Avon Gorge in Bristol, used to be so popular back in the 18th and 19th century that the amount of geode hunting done to find them back then was very extensive. (http://www.exeterexpressandecho.co.uk/cheap-diamonds-rage/story-13730197-detail/story.html). Although the amount of quarrying done back then has lead to exhaustion of once ready supply of Bristol Diamonds, they can still be found today. Whether you want to look for geodes that contain Bristol Diamonds or you just want to find any kind of geode, finding geodes can still be a really fun activity.
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