| 11. | The Nilgiri system comprises charnockites ranging from granites to gabbros.
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| 12. | It also occurs as a secondary mineral in altered gabbro and diorite.
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| 13. | The landscape is rocky with basalt, gabbro and sandstone.
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| 14. | This is true of many gabbros, aplites and granites.
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| 15. | Gabbro is a plutonic rock with the same chemical composition as basalt.
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| 16. | The side of the pit consists of Precambrian gabbro.
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| 17. | Xenoliths containing quartz and gabbro nodules also have part in the rock composition.
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| 18. | Its igneous rock consists mostly of pyroxenite and gabbro.
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| 19. | Rocks like olivine or gabbro can be dug up.
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| 20. | He was also first to find Gabbro in Iceland.
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