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 are Deep Sky Objects?When was the pressure cooker first introduced?Who invented Vulcanized Rubber?What is the name of the Sat Nav for Europe?What is an astrolabe?