Vanadium And Magnetite In Aggregate Sand Mining. ironsand, also known as iron-sand or iron sand, is a type of sand with heavy concentrations of iron.it is typically dark grey or blackish in colour. it is composed mainly of magnetite, fe 3 o 4, and also contains small amounts of titanium, silica, manganese, calcium and vanadium..,separation upgrading and mineralogy of placer magnetite,jul 10 ...