Magnesiferous is a term that refers to anything that is rich in magnesium. There are a number of synonyms that can be used to describe this quality, including magnesium-rich, magnesian, magnesious, and magnesic. These terms can be used interchangeably to describe minerals, rocks, and other substances that contain significant amounts of magnesium. In addition to its use in scientific and technical contexts, these synonyms can also find use in everyday language to describe things like foods or beverages that are high in magnesium, or to identify supplements or nutritional products that contain this essential mineral.