Picrite is a rare and unusual type of igneous rock that is mainly composed of olivine and augite minerals. It is most commonly found in volcanic rocks and has a distinctive greenish-black color. Although there are no direct synonyms for picrite, it can be sometimes referred to as an ultramafic rock due to its high content of magnesium and iron-rich minerals. Other terms that might be used in place of picrite include ultrabasic rock, mantle rock, or basaltic ultramafic rock. These terms are often used interchangeably with picrite, but they have slightly different compositions and properties. Regardless of the term used, these rocks are highly sought after by geologists due to their unique mineral composition and interesting geological origins.