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This flow consists of about 30 percent plagioclase, clinopyroxene, and olivine , as small phenocrysts.
All basalt chemical compositions can be plotted in the basalt tetrahedron, which has normative quartz, olivine , nepheline and augite at the apices.
They contain olivine , clinopyroxene, plagioclase, analcite, ulvospinel and apatite + / - biotite + / - calcite.
Observations by Spirit show the rock contains significant amounts of the minerals olivine , pyroxene and magnetite, all of which are common in some types of volcanic rock.
Fractionation of ferromagnesian phases such as olivine , pyroxene and magnetite must have taken place during magma emplacement, as is suggested by the low Co abundance.
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