Mugearite (/ˈmʌɡiəraɪt/) is a type of oligoclase-bearing basalt, comprising olivine, apatite, and opaque oxides.

In the TAS classification of volcanic rock, mugearite is classified as sodium-rich basaltic trachyandesite.

These examples of mugearite were formed during a period of continental flood basalt[4] volcanic activity that happened in western Scotland during the Paleogene period of the Earth's geological history, when the North Atlantic Ocean opened between Europe and North America.

Examples are Hawaii, Ascension Island, Saint Helena, Réunion, Mauritius and Tahiti.

[5] Analysis of a Martian rock found by the Curiosity rover and named "Jake Matijevic" (or "Jake M"), after a NASA engineer, determined that this Martian rock is very similar to mugearite erupted on Earth.