Scientists recently confirmed that some zircon crystals found in Australia are 4.4 billion years old. These crystals are the oldest material formed on Earth known to man.To put things in perspective, the age of Earth is about 4.5 billion years. Here is a timeline of our planet.
Zircon is one of the birthstones associated with the month of December.
Image Credits: Andree Valley, John Valley, and http://www.news.wisc.edu/ for History of Planet and Zircon’s images