Layered intrusions with cumulate peridotite are typically associated with sulfide or chromite ores. Geologists have described it as a coarse-grained olivine-plagioclase cumulate with a granular polygonal texture. Cumulate harzburgite is found in some large layered igneous intrusions. Often, cumulate layers are polyminerallic, forming gabbro, norite and other rock types. It is very rare but not unknown to see cumulate sulfide rocks in granitic intrusions. Cumulate gabbros are more properly termed "pyroxene-plagioclase adcumulate". The sulfide minerals generally form an interstitial matrix to a silicate cumulate. Chassigny is an olivine cumulate rock (dunite). Vestian asteroids have a composition akin to cumulate eucrites (HED meteorites). This also alters the chemistry of the cumulate, and the depletions of the residual melt. Cumulate peridotites are also formed in komatiite lava flows. Otherwise, complex calculations of averaging cumulate layers must be utilised, which is a complex process. These deals cumulate to an overall value of 1,935 bil. These deals cumulate to an overall value of around 2,031 bil. The cumulate rocks form much of the crust.