Discussion
The extrusive igneous rock that contains calcium-rich plagioclase, feldspathoid, olivine and pyroxene are termed as :
Answer: B
The rock is basanite.
Basanite is a silica-undersaturated basaltic rock containing calcic plagioclase, a feldspathoid (nepheline or leucite), olivine and clinopyroxene. The olivine distinguishes it from tephrite, which has the same minerals without olivine.
Nephelinite has the feldspathoid but essentially no plagioclase. Basalt has plagioclase, pyroxene and often olivine but no feldspathoid. Coppaelite is a rare kalsilite-melilite rock with neither plagioclase nor the assemblage described.
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