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In the Smithsonian kits, these are called 'frosty diamonds'.

In the Smithsonian kits, these are called 'frosty diamonds'.

Anne Helmenstine
These crystals are called 'frosty diamonds' if you grow them from the Smithsonian crystal geodes kit. You can get similar results if you grow the crystals yourself using alum and a small rock in a bowl.
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