Texas Natural Resources Code - NAT RES § 51.079. Transfers Generally

(a) An owner of public school land purchased from the state may sell the land or a definite portion of the land in any size tract.

(b) If land to be sold is separated from another portion of land but is not sufficiently designated by metes and bounds in the papers offered to be filed so that it may be identified with certainty, the commissioner shall require that proper field notes accompany the papers before he files them and separates the land.