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Geodes are simply fascinating. These are tricks of nature, hiding in plain sight, appear to be plain rocks have gorgeous crystal formations hidden deep within the recesses of their protective shells. The exterior can range from a light tan to a dark colour on the outside.

For those who take the time to carefully crack the tough mineral shell, there is a treasure awaiting. Depending upon where the crystal was formed, it may be a single crystal or a combination of crystals.

The 7 most common types of geodes are:

  • Agate (Some geodes are dyed by the supplier to bring out the beauty of the crystal)

  • Amethyst

  • Calcite (most commonly clear)

  • Citrine (Natural and heat treated)

  • Celestite

  • Quartz (most commonly clear)

Since many of these crystals develop together, you may find combinations of crystals running together like quartz with calcite. While geodes may belong to the common crystals mentioned in the list above, they may also include chalcedony, or jasper banding or crystals such as dolomite.


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