'Chalk' in the Bible

Therefore Jacob’s iniquity will be purged in this way,and the result of the removal of his sin will be this:when he makes all the altar stoneslike crushed bits of chalk,no Asherah poles or incense altars will remain standing.

And the peoples will be like the burning of chalk: as thorns cut down, which are burned in the fire.

The worker in wood stretcheth out a line; he marketh it out with red chalk; he formeth it with sharp tools, and he marketh it out with the compass, and maketh it after the figure of a man, according to the beauty of man: that it may remain in the house.