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CORALSTONE

The coral stone is a historical and architectural landmark in Stone Town, the old town of Zanzibar, which is also a UNESCO World Heritage Site. 

Coral stone is a traditional building material primarily used along the coast of Zanzibar. It is a light-colored, porous stone made from the remains of coral reefs and other marine organisms that have been deposited in the waters around the island over thousands of years. The stone is mainly used for the construction of houses and other buildings and is an important part of local architecture.

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Coral reefs are marine habitats of critical ecological importance, present in tropical and subtropical shallow coastal waters around the equator. They can encompass thousands of species, making them one of the most diverse ecosystems in the marine environment. Biologically produced calcium carbonate (CaCO3) structures form the foundation of coral reef ecosystems.

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The use of coral stone has a long tradition in Zanzibar, dating back to the time of the Arab seafarers and later European colonial rule. The stone blocks are often used in combination with other materials such as wood, mortar, and clay to create stable and well-insulated structures. The advantage of coral stone lies in its natural thermal insulation and ability to regulate humidity properties that are particularly appreciated in the hot and humid climate conditions of Zanzibar.

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Today, coral stone is not only a functional building material but also a symbol of Zanzibar's cultural identity. Many of the historic buildings are built from this unique stone, which characterizes the image of the island. In addition, coral stone is still used in modern building projects, both for new construction and restoration. In recent years, the demand for coral stone has also increased due to its aesthetic qualities, as the natural hue and texture of the stone create a warm and rustic atmosphere.

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Despite its tradition, there are now efforts to regulate the extraction of coralstone in order to protect the fragile coral reefs from which the stone comes. The growth of tourism and increased construction activity has led to a greater demand for coralstone, which in turn could increase the environmental impact on coral populations. 

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Increasing emphasis is therefore being placed on sustainable practices and alternatives to preserve Zanzibar's natural environment while simultaneously protecting the heritage of traditional architecture.

This is exactly where the CO3 project comes in to protect the vital carbonate (CO3) of coral reefs: the Collaboration for the Conservation of Coral Stone.

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EXAMPLES

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