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Geodes are spherical to subspherical rock structures with an internal cavity lined with mineral. They have a durable outer wall that is more resistant to weathering than the surrounding bedrock. This allows the geode to survive intact when the surrounding bedrock weathers away. The mineral lining the cavity is often a scintillating druse of tiny quartz crystals underlain by multiple bands of translucent grey and white agate. Many are lined with more spectacular treasures.
Rich purple amethyst, perfect white calcite crystals, and colourful banded agate are other common linings. Rare examples can be filled with beautiful blue gem silica, pink rhodochrosite, spectacular opal with vivid play-of-colour or other rare materials. Geodes range in size from under one centimetre to several metres in length. From the outside most look like common rocks, but when they are opened the sight can be breath-taking.
People buy Crystals because they enjoy them. They love tiny crystals and geodes as jewellery, sawn and polished as bookends, and last but not least, spectacular amethyst geodes as items of home or office decor.