'Flinty' in the Bible

who is causing thee to go in the great and the terrible wilderness -- burning serpent, and scorpion, and thirst -- where there is no water; who is bringing out to thee waters from the flinty rock;

He made him ride on the high places of the earth, that he might eat the increase of the fields; and he made him to suck honey out of the rock, and oil out of the flinty rock;