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Andrew Alden

The Textures of Igneous Rocks

By April 17, 2013

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igneous rock texturesIf you've learned to tell igneous rocks from sedimentary and metamorphic rocks, you're ready for the next step, which is to learn the eight basic textural terms that geologists use when describing igneous rocks. Texture is the close-up character of the rock—the size and relationships of the grains that make it up, plus a few other important characteristics like the presence of holes and so on. See them in this gallery.
Vesicular texture — Geology Guide photo

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