| 21. | He studied the monazite and rare-earth elements of the Appalachian Mountains.
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| 22. | A single monazite grain can contain domains of distinctively different compositions and ages.
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| 23. | In natural monazite, the zonation pattern maybe complex and hard to interpret.
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| 24. | Monazite geochronology is generally regarded as a powerful tool to reveal metamorphic history.
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| 25. | This can be observed with monazite-containing sands or bastn�site-containing ore.
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| 26. | There are also large monazite deposits in Australia.
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| 27. | However, commercial monazite sands typically contain between 6 and 12 % thorium oxide.
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| 28. | As a tin-mining area, monazite exists throughout Bangka and Belitung island.
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| 29. | Therefore, older monazite is rich in Th while younger monazite contains less Th.
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| 30. | Therefore, older monazite is rich in Th while younger monazite contains less Th.
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