Nonpetroleum Minerals | TX Almanac
BENTONITE (see CLAYS) ... Much of the state’s bituminous coal occurs in North Central Texas. Deposits are found there in Pennsylvanian rocks within a large area that includes Coleman, Eastland, Erath, Jack, McCulloch, Montague, Palo Pinto, Parker, Throckmorton, Wise, Young, and other counties. ... (calcium-magnesium carbonate), commonly is ...