International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks ...

Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the ...

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From the lab bench to the field, learning to identify rocks is about more than memorizing names—it’s about reading the story each stone tells. By observing texture, composition, and formation clues, ...

Become a backyard geologist—in one week National Geographic's Wonder Lessons will teach you how to navigate the stars, spot cloud types, recognize common trees, and identify different kinds of rocks.