The sphalerite composition is favored at 298k by 13kJ/mol, but at 1296K the transition to wurtzite happens.3 Mining was unmechanized and labor-intensive, with pickmen releasing the ore through the rock, and mine-boys or carusi carrying baskets of ore into the floor, normally by way of a mile or more of https://fridad752oyk1.wikimillions.com/user