| 21. | There are bands of ultramafic rock near the Missisquoi River valley, and basalt also occurs.
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| 22. | Ultramafic rocks also contain elevated amounts of chromium and nickel which may be toxic to plants.
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| 23. | Thus, ultramafic rocks have high Sm and low Nd and therefore " high"
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| 24. | Ultramafic rocks lack aluminium, which allows carbonate to react with magnesium silicates to form talc.
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| 25. | It comprises pillow basalts, dolerites, gabbros, ultramafic rocks, cherts and massive sulfides.
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| 26. | It occurs as replacements of copper and nickel phases in serpentinites and other altered ultramafic rocks.
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| 27. | Pargasite is a rare magnesium-rich amphibole with essential sodium, usually found in ultramafic rocks.
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| 28. | "Nepenthes danseri " most commonly inhabits open scrub or bare soils on ultramafic rock.
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| 29. | His primary field of expertise is the formation and plate tectonic setting of ophiolites and ultramafic rocks.
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| 30. | Several igneous associations are noted : high-alumina basalts, ultrapotassic igneous rocks, and ultramafic rocks.
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