Discussion
Intrusive igneous rock that is composed essentially of nepheline and an alkali pyroxene, usually aegirine-augite is called :
Answer: D
The rock is ijolite.
Ijolite is a plutonic alkaline rock made essentially of nepheline and aegirine-augite (a sodic pyroxene), with little or no feldspar. It typically occurs in alkaline ring complexes associated with carbonatites, such as those of the East African rift.
Wehrlite (olivine and clinopyroxene) and harzburgite (olivine and orthopyroxene) are ultramafic peridotites without nepheline. Limburgite is a glassy volcanic rock rich in olivine and augite, not an intrusive nepheline rock.
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