... 5000 mesh 3,application:rubber,flame retardant,plastic 4,color:white BruciteIt is a mineral that is not often used as ... an additive in certain refractories.PHYSICAL CHARACTERISTICS:Color is white or colorless with shades of gray,blue and greenLuster is vitreous or ... ,aragonite,serpentine,chromite,dolomite,magnesite,periclase and other magnesium minerals. white brucite