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Igneous rocks

Igneous rocks

Igneous rocks

  • Exhibition Text

    • Igneous rocks solidify from molten rock (called magma within the Earth and lava on the surface). They are identified by mineral content and texture — the size and shape of their mineral grains.

      Texture is controlled by the rate of cooling: magma that cools slowly deep in the Earth forms rock with large crystals, and lava that cools quickly on the surface forms fine-grained rock.

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  • For Educators

    • Topic: Earth Science

      Subtopic: Earth Formation/Evolution

      Keywords: Magmas, Minerals, Igneous rocks, Physical geology

      Audience: General

In This Section

Granite Pegmatite

Granite pegmatite

This rock formed deep in the crust, near the top of a crystallizing magma chamber. 



This rock solidified from a basaltic magma within a few hundred meters of the surface, probably beneath a volcano.



This rock crystallized in a mountain belt.

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