👉 Claustralite is a mineral compound that occurs in the rocks of the Northern Hemisphere. It is commonly found in the sediments of the Arctic region, and it was named after the city of Claustral in France, where it was first discovered. It has a crystalline structure with two layers: an inner layer made up of hydroxyapatite (a type of calcium phosphate), and an outer layer composed of iron oxide. The mineral is highly reactive and can be easily oxidized