| 11. | It is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium.
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| 12. | The rock is non-alkali pyroclastic flow or mafic rock, dating from the Late Pleistocene to the Holocene.
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| 13. | The lava has formed a series of mafic rock that form the Southern Cordilleran Basaltic Andesite Suite.
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| 14. | The source of ilmenite, garnet, sapphire and diamond is ultramafic and mafic rocks, such as kimberlite or basalt.
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| 15. | Felsic and mafic rocks tend to be less affected by carbon dioxide due to their higher aluminium content.
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| 16. | Advanced carbonation of felsic and mafic rocks, very rarely, creates fenite, a metasomatic alteration caused particularly by carbonatite intrusions.
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| 17. | Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic.
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| 18. | The darker soils, which support higher plant diversity, have developed on mafic rock; the medium-toned soils are on felsic rock.
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| 19. | Continents must also be made up of less dense felsic rocks that " float " on underlying denser mafic rock.
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| 20. | In the mafic rocks labradorite, anorthite and bytownite prevail, being rich in lime and poor in silica, potash and soda.
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