Definition

A type of rock that is formed from clay and is harder than shale but does not have the layered structure of slate.

Example

The geologist collected samples of argillite to study its properties.

Conversation

Have you ever heard of argillite?

No, I haven't. What is it?

It's a type of rock that falls between shale and slate.

That sounds interesting! I didn't know there were so many types of rocks.

Synonyms & Antonyms

Root Explanation

Argillite is formed from "argilla" (from Latin, meaning clay) and "-ite" (a suffix used in geology to denote rocks or minerals). The word refers to a type of rock that is primarily composed of clay.

Memory Tip

Think of 'argilla' meaning clay, and remember that 'argillite' is a rock made from clay.

Visually Confused Words