Minerals / Chalcedony, Sahara desert.

This chalcedony geode is composed of cryptocrystalline  quartz and moganite, both of which are varieties of silica SiO2. The chalcedony is almost clear, and the crystalline centre and growth rings can be easily seen. To look at the specimen is almost like looking into a pool of water. The very loose location description is the Sahara desert.

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