| 21. | Chromium is commonest in mafic and ultramafic rocks in which beryllium is extremely rare.
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| 22. | At the veins in amphibolites and ultramafic rocks.
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| 23. | It occurs as incrustations and vein or fracture fillings in ultramafic rocks and serpentinites.
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| 24. | The known distribution of this species appears to roughly correlate with ultramafic substrate occurrence.
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| 25. | The genus is well diversified on ultramafic rocks and some species are nickel hyperaccumulators.
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| 26. | It grows in mountainous habitat on ultramafic rock substrates, often in serpentine soils.
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| 27. | Samples of the ridge from the Afanasy Nikitin Seamount were ultramafic dunite . hotspot.
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| 28. | It likely grows in forest on ultramafic soils.
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| 29. | Ultramafic xenoliths have been found in the rocks.
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| 30. | Mantle plume hypotheses may rely on identifying mafic and ultramafic intrusions and coeval basalt volcanism.
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