Definition

Referring to a type of rock or mineral that is very low in silica and high in iron and magnesium content.

Example

The geologist studied the ultramafic rocks to understand their formation.

Conversation

Have you heard about the ultramafic rocks they found near the volcano?

Yeah, I read that they contain a lot of magnesium and iron.

It's interesting how those ultramafic rocks can tell us about the Earth's mantle.

Definitely! They offer a unique perspective on geological processes.

Synonyms & Antonyms

Root Explanation

Ultramafic is formed from "ultra-" (meaning beyond) and "mafic" (derived from the combination of "magnesium" and "ferric", referring to magnesium and iron-rich minerals). The term describes igneous rocks that are rich in magnesium and iron, going beyond the typical composition of mafic rocks.

Memory Tip

Think of 'ultra-' meaning beyond, and 'mafic' referring to magnesium and iron-rich minerals — ultramafic rocks are those that go beyond the usual mafic composition.

Visually Confused Words