| 41. | The floral assemblages associated with highly nickeliferous ultramafic rocks are indicative tools for mineral exploration.
|
| 42. | There are bands of ultramafic rock near the Missisquoi River valley, and basalt also occurs.
|
| 43. | Ultramafic rocks also contain elevated amounts of chromium and nickel which may be toxic to plants.
|
| 44. | Thus, ultramafic rocks have high Sm and low Nd and therefore " high"
|
| 45. | Ultramafic rocks lack aluminium, which allows carbonate to react with magnesium silicates to form talc.
|
| 46. | It is found in ultramafic ridges.
|
| 47. | It comprises pillow basalts, dolerites, gabbros, ultramafic rocks, cherts and massive sulfides.
|
| 48. | It occurs as replacements of copper and nickel phases in serpentinites and other altered ultramafic rocks.
|
| 49. | Pargasite is a rare magnesium-rich amphibole with essential sodium, usually found in ultramafic rocks.
|
| 50. | Low silicon content is indicative of mafic and ultramafic igneous rocks, such as basalt and dunite.
|
