Discussion
Harzburgite is ultramafic igneous rocks having composition :
Answer: A
Harzburgite is made of olivine + orthopyroxene.
Peridotites are ultramafic rocks with more than 40% olivine and are named by their pyroxenes: harzburgite contains olivine and orthopyroxene with little or no clinopyroxene, lherzolite contains olivine with both orthopyroxene and clinopyroxene, and wehrlite contains olivine with clinopyroxene. Harzburgite is typical of depleted mantle from which basalt has been extracted, as in the mantle sections of ophiolites.
Olivine alone (more than 90%) is dunite. Orthopyroxene with clinopyroxene is websterite, and pyroxene alone is pyroxenite.
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