Corundum Stone Mill Gems And Gem Minerals Of Nort
During the late 1800s, corunduma mineral second in hardness only to diamondwas mined extensively in north Georgia and North Carolina. Corundum was valuable in the manufacture of abrasives such as sandpaper. Corundum Wikipedia. Corundum for abrasives is mined in Zimbabwe, Pakistan, Afghanistan, Russia, Sri Lanka, and India. Historically it