Mode of occurrence of manganese ores.

Manganese ores primarily occur in two forms: oxide and carbonate ores. The most common manganese ore is pyrolusite (MnO2), which is an oxide. Manganese also occurs as carbonates, such as rhodochrosite (MnCO3), in certain deposits. These ores are found in a variety of geological settings, _______ __________ _________ ___ ___ ____ ___ ______ _______ ________ ____ _______.
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