Zircon Crystals of Volcanic Origin Allow the First Radiometric Age in the Vicksburg Group of Mississippi
David T. Dockery III, RPG, MDEQ, and Thomas E. Yancey, Department of Geology and Geophysics, Texas A&M University
Zircon is a birthstone for the month of December, but geologists know it as a birthstone for the Earth. The oldest known rocks on earth are zircon crystals from Jack Hills, Australia, with a radiometric age of 4.375 billion years plus or minus 6 million years (
, February 23, 2014). Zircon crystals are one of the toughest mineral substances and preserve a trustworthy chemical record.