Cumulate rock
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Cumulate rocks are igneous rocks formed by the accumulation of crystals from a magma either by settling or floating. Cumulate rocks are named according to their texture; cumulate texture is diagnostic
Close-up view of a cumulate rock from Montana (scale: about 45 millimetres (1+3⁄4 in) across)
Layers of cumulate rock (gabbro) in Oman
Dark layers of chromite-rich cumulate rock alternating with light layers of plagioclase-rich rock in the Bushveld Igneous Complex, South Africa
Pyroxenite
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Pyroxenite is an ultramafic igneous rock consisting essentially of minerals of the pyroxene group, such as augite, diopside, hypersthene, bronzite or enstatite. Pyroxenes have the general formula XY2O
Pyroxenite from Rustenburg, South Africa
Metamorphosed (serpentinized) clinopyroxenite, made of green diopside, from the Shetland ophiolite, Unst, Scotland