Magnetite et al. is a term used to refer to a group of iron ores that contain the mineral magnetite. These ores are important sources of iron and are found in many parts of the world. Magnetite et al. includes other minerals such as hematite, limonite, and siderite, which are all iron ores. The term is often used in the mining industry to refer to a group of iron ores that can be mined and processed for their iron content.