Ankerites
Ankerites are a group of minerals belonging to the carbonate mineral class. They are characterized by their chemical composition, which includes calcium, iron, magnesium, and manganese. Ankerites typically form in low-temperature hydrothermal veins and are commonly found in metamorphic and sedimentary rocks. These minerals often exhibit various shades of brown, red, or black and can occur in crystal form or as massive aggregates. Ankerites are valued for their aesthetic appeal and are sometimes used as decorative stones or in the production of iron ore.