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Fluid and Fire: Igneous Rocks

Igneous Rock Textures. Igneous rocks have four basic types of textures: glassy, fine-grained, coarse-grained and porphyritic. . Glassy Igneous. Glassy igneous rocks are shiny and look like glass. The minerals that make up a glassy igneous rock are not organized into crystals. Obsidian has a glassy texture..

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Fluid and Fire: Igneous Rocks

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