Websterite is one of the important type of rocks. If we have to define Websterite in general, Websterite is ultramafic and ultrabasic rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a special type of pyroxenite.. Websterite comes under Igneous Rocks. All Igneous Rocks have similar properties and formation process. Along with Websterite Definition, know more about the History of Websterite, Etymology of Websterite in next sections.