Sentences with phrase «by pyroxene»
The north - south variation in minerals indicates that the deep crust exposed in the southern Rheasilvia region is dominated by pyroxene - rich, diogenitic material while the equatorial region seems to retain the most ancient eucrite - rich mineralogy.
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Although the heat of the upper mantle might help the olivine or pyroxene crystals within the rocks grow larger again, or «heal,» the two rock types are competing for space: Each is actually inhibited in its growth by the other's presence.