The sphalerite construction is favored at 298k by 13kJ/mol, but at 1296K the transition to wurtzite occurs.3 Mining was unmechanized and labor-intense, with pickmen releasing the ore with the rock, and mine-boys or carusi carrying baskets of ore for the surface area, frequently through a mile or more of tunnels. https://gwendolynj023gda2.blogsmine.com/profile