What is Zircon? Zircon is the oldest known mineral crystal which belongs to the group of nesosilicates. They have been found in some igneous rocks which scientist believe date back 4.4 billion years ago. Its chemical name is zirconium silicate. Other interesting facts...What’s the difference between a tornado, hurricane, typhoon and a cyclone?First ever words spoken on a telephoneWhen was the pressure cooker first introduced?What are Deep Sky Objects?What the difference between a Meteor and a Meteorite?