👉 Talcoid is a type of mineral that forms when iron oxide (calcium carbonate) dissolves in water. These minerals are commonly found in rocks and soil, but they can also be present naturally on the surface of rocks or other materials. In general, talcoids are typically found in rocks and soils that contain high levels of calcium carbonate. They can vary in size from tiny specks to large crystals, depending on the composition of the mineral's parent rock. Talcoids are often
