Enhydro agate
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Enhydro agates are nodules, agates, or geodes with water trapped inside its cavity.[1] Enhydros are closely related to fluid inclusions, but are composed of chalcedony. The formation of enhydros is still an ongoing process, with specimens dated back to the Eocene Epoch.[2] They are commonly found in areas with volcanic rock.[3]
Enhydro agates are made up of banded microcrystalline or cryptocrystalline quartz.[2] The agate has a hollow center, partially containing water. Enhydro agates can also contain debris or petroleum. Because the cavity is not full, the agate can produce sound from being shaken. Agates vary in size. The largest recorded agate was found in Fuxin City, China, with a diameter of 63 cm (24.8 in) and weighing 310 kg (683 lbs).[4]
