'Dust' in the Bible

On the third day a man with torn clothes and dust on his head came from Saul’s camp. When he came to David, he fell to the ground and paid homage.

And Tamar, in her grief, put dust on her head; and she put her hand on her head and went away crying loudly.

When David came to the summit where he used to worship God, Hushai the Archite was there to meet him with his robe torn and dust on his head.

And as David and his men went by the way, Shimei went along on the hill's side over against him, and cursed as he went, and threw stones at him, and cast dust.

And kept going across the river to take the people of the king's house over, and to do whatever was desired by the king. And Shimei, the son of Gera, went down on his face in the dust before the king, when he was about to go over Jordan,

Then did I beat them as small as the dust of the earth, I did stamp them as the mire of the street, and did spread them abroad.