Radioactive method for dating rock
Zircon has a high hardness (7.5) which makes it resistant to mechanical weathering, and it is also very resistant to chemical weathering. Chemically, zircon usually contains high amounts of U and low amounts of Pb, so that large amounts of radiogenic Pb are produced.
Other minerals that also show these properties, but are less commonly used in radiometric dating are Apatite and sphene.
Theoretically, Creationism remains workable within a wide range of age estimates.
Various radioactive elements are involved, including Carbon-14, Uranium-238, Thorium-232, and Potassium-40.