(of) the white substance forming the tusk of elephants

fair

(an example of) a kind of hard stone with patterns, used when polished for building a sculpture; a small ball of coloured glass used in games played by children

of or like marble

of, like, milk; (of a liquid) cloudy, not clear

white, cloudy

of the colour of fresh snow or common salt; a colourless part, e.g. round the yolk of an egg

extremely pale; lacking color