Geode halves, or Oco's, which is the word used in Brazil where they are found, are tiny agate nodules with a geode center. Agate is named after a river in Sicily, called Achates, where it was found in the fourth century, B.C. In the center of the rock, where there is a cavity, crystals often form, thus the name geode.
The formation in which the geodes are found is 50 million years old and located in many areas, including the United States. The oco's have been gathered by farmers for many years. After the crops are harvested and the farmers are unable to work, the fields are tilled under, allowing the oco's to appear. They are then gathered and sold for cutting into geode halves.
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