1. In 1999, Wilde extracted more zircons from the 1984 rocks. 2. Heat treatment also imparts greater brittleness to zircon and characteristic inclusions. 3. Apatite, ilmenite, magnetite and zircon can also be found. 4. Traces of garnet, zircon , topaz, and tourmaline occur. 5. Zircon crystals are also some of the most incompressible silicate minerals.6. Zircons are formed at high temperatures, from melted rocks.7. Because of their uranium and thorium content, some zircons undergo metamictization. 8. Associated minerals include zircon , aegirine, apatite, perovskite and columbite. 9. Apatite, zircon and magnetite are practically always present as accessory minerals. 10. The dating method is usually performed on the mineral zircon .
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