Discussion
A rock having composition-Nepheline-olivine-clinopyroxene-plagioclase known as :
Answer: B
The rock is Basanite.
Basanite is a silica-undersaturated basaltic rock containing plagioclase, clinopyroxene, a feldspathoid (usually nepheline) and more than 10% olivine, exactly the assemblage given.
The near misses are distinguished by olivine and nepheline. Tephrite has the same minerals but little or no olivine. Troctolite is a plutonic rock of plagioclase and olivine with little pyroxene and no nepheline. Olivine norite is a gabbroic rock with orthopyroxene and olivine, also without nepheline.
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