The sphalerite framework is favored at 298k by 13kJ/mol, but at 1296K the changeover to wurtzite takes place.3 Mining was unmechanized and labor-intensive, with pickmen releasing the ore within the rock, and mine-boys or carusi carrying baskets of ore into the floor, normally via a mile or more of tunnels. https://aabyen317mzo5.dreamyblogs.com/profile