ultramafisiin
Ultramafisiin, or ultramafic rocks, are a class of igneous rocks defined by high magnesium and iron content relative to silica. They are typically dark-colored and dominated by minerals such as olivine and pyroxene, with comparatively little feldspar.
Common ultramafic rock types include peridotites (dunite, harzburgite, and lherzolite), pyroxenites, and serpentinites (altered ultramafics). Their
Formation and occurrence: Ultramafiin rocks are widespread in the Earth's mantle and in the oceanic lithosphere.
Geochemical and economic aspects: They typically have silica contents lower than felsic rocks and are enriched
In geology, ultramafiin rocks are closely related to peridotite, dunite, harzburgite, lherzolite, serpentinite, ophiolite, and mantle