| 21. | It is composed of relics of carbonatite intrusion, now appearing as carbonatite ring and subsided central part.
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| 22. | It is composed of relics of carbonatite intrusion, now appearing as carbonatite ring and subsided central part.
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| 23. | Laterite covers are formed on both sides of carbonatite ring with accumulation of residual ferruginous-manganese minerals.
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| 24. | Some of these terrestrial rocks are carbonatite, kimberlite, alkaline syenite, some rocks of sills and anorthosite.
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| 25. | Porphyric carbonatite are formed by fast cooling of semi-crystallized magma, or in contact with cool environment.
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| 26. | It is a carbonatite-fenite complex of oval outline with a longer axis orientated approximately north-south.
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| 27. | The carbonatite has important resources of rare earth elements and is currently managed by ASX-listed Peak Resources.
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| 28. | The dikes or sills consist either of phonolite, tinguaite, lamprophyre micromalignite, lamprophyre micromelteigite, or carbonatite.
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| 29. | It occurs in an igneous carbonatite sill in Montreal, Canada in the Francon Quarry where it was first discovered.
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| 30. | The genesis of this Archaean carbonatite remains contentious as it is the sole example of an Archaean carbonatite in Australia.
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