Which Island is composed of phosphate?

Nauru is an island in the middle of the Pacific Ocean. It is closest to the continent of Australia. Unlike most other islands, Nauru is made up of phosphate. This mineral can be extracted and it is easily extracted on this island. For years, Nauru was extracted for its phosphate. Many citizens living on the island were residing comfortably due to the export of this product.

However, after years of this, the consistent extraction of the material has caused damage to the land and environment. Now, there is no more on the phosphate that can be knowingly extracted. There are a couple of surrounding islands that also have phosphate and they are Banaba and Kribati. Most of the land on the Nauru Island is damaged from the mining.