Which mineral is present in all types of igneous rocks (except sometimes ultra-mafic)?

1 answer:

8 0

The mineral is present in all types of igneous rocks biotite, quartz, olivine, amphibole, plagioclase, and K-feldspar.

Ultramafic metamorphic rocks arise from the metamorphism of mantle rocks and some oceanic crusts and contain mainly magnesium, silicon, and carbon dioxide, with minor amounts of iron, calcium, and aluminum.

Ultramafic intrusions include dunite, peridotite, and pyroxene. another rare variety is troctolite, which has a high proportion of calcareous plagioclase. these are classified as anorthosite. gabbros and nitrites often occur in the upper part of the layered ultramafic series.

Basalt and gabbro are the names for mafic igneous extrusions and intrusions, peridotite being ultramafic and komatiite being the equivalent of fine-grained extrusions.

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