Manganese Ore is an FFXIV crafting material gathered by the Miner class, a Disciple of the Land. Ore rich in manganese. It’s a common ingredient used to make other crafting resources for Blacksmith, Armorer, and Alchemist.
You can find the material within Level 90 Mineral Deposits around The Hungering Gardens (X: 25.3, Y: 9.9), in the Misopses Euros region of Elpis. Before you can acquire the resource from the node, you must first unlock the Miner class. Then you need to be at least Level 86 before you can tap these nodes and acquire this material.
This is the only material in the node.