二辉橄榄岩(Lherzolite)为一种超基性火成岩，组成成份为40%至90%的橄榄石与较少(通常低于10%)的直辉石与斜辉石。二辉橄榄岩是组成地函的主要岩石种类之一，当地函深度不同时，会形成不同的两个相：尖晶石质二辉橄榄岩(存在较浅深度的地函)与石榴子石二辉橄榄岩(存在较深的地函)。在地表上，二辉橄榄岩可在蛇绿岩系的下段露头中找到，代表地函物质的出现；另外它也很常出现在基性或超基性喷出岩的捕获岩中。

Lherzolite is a type of ultramafic igneous rock. It is a coarse grained rock consisting of 40 to 90% olivine along with significant orthopyroxene and lesser calcic chromium rich clinopyroxene. Minor minerals include chromium and aluminium spinels and garnets. Plagioclase can occur in lherzolites and other peridotites that crystallize at relatively shallow depths (20 – 30 km). At greater depth plagioclase is unstable and is replaced by spinel. At approximately 90 km depth, pyrope garnet becomes the stable aluminous phase. Garnet lherzolite is a major constituent of the Earth's upper mantle (extending to ~300 km depth). Lherzolite is known from the lower ultramafic part of ophiolite complexes (although harzburgite is more common in this setting), from alpine-type peridotite massifs, from fracture zones adjacent to mid-oceanic ridges, and as xenoliths in kimberlite pipes and alkali basalts. Partial melting of spinel lherzolite is one of the primary sources of basaltic magma.