| 11. | Naturally occurring zircon has impurities such as uranium and thorium.
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| 12. | Biotite is virtually absent, but zircon is very common.
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| 13. | Here it may be possible to find sapphires or zircons.
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| 14. | Ages of detrital zircons from sediments of five Russian rivers, after.
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| 15. | The upper plot shows foreland basin detrital zircon age distribution.
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| 16. | The lower plot shows hinterland ( source area ) zircon age distribution.
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| 17. | In the plots, n is the number of analyzed zircon grains.
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| 18. | Thermally, zircon is resistant to temperature changes and extremes.
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| 19. | Inclusions of apatite, monazite and zircon are also contained in allanite.
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| 20. | Zircon temperatures are, and for Guacha, Tara and Chajnantor respectively.
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