| 1. | Erebus is the world's only presently erupting phonolite volcano.
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| 2. | Phonolite occurs in the related Pilanesberg Complex and Pienaars River Complex.
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| 3. | This mountain is a volcanic cone consisting of trachyte and phonolite.
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| 4. | It is filled with small volume tephritic phonolite and phonolite lava flows.
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| 5. | It is filled with small volume tephritic phonolite and phonolite lava flows.
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| 6. | Later activity produced trachyte and phonolite plugs and lava flows.
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| 7. | It is made of a type of rock called phonolite.
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| 8. | Rock types are made up of phonolite and ignimbrite.
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| 9. | These include nephelinite, basanite and peralkaline phonolite, trachyte and comendite lavas.
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| 10. | Created in 2009, it is made of a number of phonolite stones.
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