Do agates react different in water?

Agates are a type of chalcedony, which is a microcrystalline form of quartz. Quartz is a very common mineral and is found in a wide variety of colors and forms. Agates are typically formed by the deposition of silica-rich water in cavities or voids in volcanic rocks. The water slowly evaporates and leaves behind a solid mass of chalcedony.

Agates are typically very hard and durable, and they are not affected by water. However, some agates may contain inclusions of other minerals, such as iron oxide, which can react with water and cause the agate to change color.

In general, agates do not react differently in water. However, it is always a good idea to test any agate before exposing it to water for a long period of time, just in case it contains any inclusions that could react with water.