| 41. | Peridotite and dunite, when fresh, can contain up to ~ 4, 000 ppm nickel within olivine.
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| 42. | The greenish rock is a metamorphic rock consisting wholly of serpentine minerals commonly derived from the alteration of peridotite.
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| 43. | This residual is denser than the mantle peridotite and can cause delamination of the lower crust containing the residual.
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| 44. | Classic peridotite is bright green with some specks of black, although most hand samples tend to be darker green.
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| 45. | The eclogite melt may then react with enclosing peridotite to produce pyroxenite, which in turn melts to produce basalt.
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| 46. | These layers most commonly have been interpreted as products of reaction between ascending magmas and peridotite of the upper mantle.
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| 47. | Plagioclase can occur in lherzolites and other peridotites that crystallize at relatively shallow depths ( 20 30 km ).
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| 48. | Instead, extension simply pulls the crust away, exposing or " unroofing " the mantle, exposing serpentinized peridotite.
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| 49. | Experimental studies of appropriate peridotite samples document that the solidus temperatures increase by 3 �C to 4 �C per kilometer.
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| 50. | The syenites, for example, and the peridotites, are far less important than the granites, diorites and gabbros.
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