 Zigrasite is one of 3 compositional variations in zircon phosphate grains from the giant 1972 tourmaline pocket, representing the magnesium phase with malhmoodite representing the iron phase and an as of yet unnamed calcium-analogue.Zigrasite can be considered to be the magnesium end member for the zircon phosphate grains found in the giant 1972 pocket.Zigrasite exhibits hydrogen bonding which increases linkage within the layer of magnesium octahedra.