11. It occurs as incrustations and vein or fracture fillings in ultramafic rocks and serpentinites. 12. The genus is well diversified on ultramafic rocks and some species are nickel hyperaccumulators. 13. It grows in mountainous habitat on ultramafic rock substrates, often in serpentine soils. 14. Importantly, large volumes of ultramafic rocks are not found in association with Proterozoic anorthosites. 15. Particular floral assemblages associated with highly nickeliferous ultramafic rocks are indicative tools for mineral exploration. 16. Ultramafic rocks of the Hooggenoeg Formation were most likely not parental for the felsic rocks.17. Ore deposits of this type are restricted to the weathering mantle developed above ultramafic rocks . 18. It occurs in an ultramafic rock deposit. 19. Rocks in the Cobb Valley include gabbro and ultramafic rocks that are now largely serpentised. 20. The floral assemblages associated with highly nickeliferous ultramafic rocks are indicative tools for mineral exploration.
