They consist of lherzolite, harzburgite, wehrlite, dunite, websterite and garnet composed pyroxenite. Xenoliths of dunite, peridotite and spinel lherzolite in basaltic lava flows are one example. This magma produced the layered pyroxenite dunite in the ultramafic area. Olivine is a mixture of orthosilicates of iron and magnesium from the mineral dunite. The mountain consists mostly of soapstone and dunite. Rock types include picrite, peridotite, dunite, pyroxenite, gabbro and granophyre. Heazlewoodite, NiS, is a rare sulfur-poor nickel sulfide mineral found in serpentinitized dunite. There are also xenoliths including dunite, gabbro, granite, and notably ultramafic to mafic xenoliths. Chassigny is an olivine cumulate rock (dunite). Potholes and a dunite pipe are present within the area and result in geological losses. Samples of the ridge from the Afanasy Nikitin Seamount were ultramafic dunite. Mantle rocks exposed in the ophiolite are the peridotite varieties of lherzolite, harzburgite and dunite. Olivine and dunite, both found in subducted crust, are materials of this sort. Dunite is the olivine-rich end-member of the peridotite group of mantle-derived rocks.