Magnesiohastingsite is a rare mineral, which is the magnesium-dominant member of the hastingsite subgroup of the amphibole group. It has a complex composition that includes sodium, magnesium, aluminum, iron, silicon, and oxygen. Given its rarity, there is no official synonym for magnesiohastingsite. But some terms that are sometimes used synonymously with it include magnesium-hastingsite, magnesium-rich hastingsite, and magnesium amphibole. Additionally, the mineral is sometimes referred to as magnesiohastingstite, although the correct spelling is with a single 't.' Despite its scarce occurrence, magnesiohastingsite is of interest to geologists and mineral collectors alike, owing to its unique properties and crystal structure.