- Atlas of Igneous and Metamorphic Rocks, Minerals, and Textures
 - Features photomicrographs of minerals and textures in thin-sections of igneous and metamorphic rocks. - Igneous Rock Identification: Nature's Fiery Cauldron
- One of the three principal classes of rocks, they are crystalline or glassy rocks formed by the cooling and solidification of molten magma.
- Igneous Rocks
- Discusses Bowen's Reaction Series, igneous rock forming minerals, and strategies for igneous rock classification.
- Rob's Granite Page
- About granite, things granitic, and one man's quest for peer recognition.
- Igneous and Metamorphic Petrology Class Materials
- Series of PowerPoint lectures covering topics such as igneous classification, magma generation, mid-ocean ridge basalts, and metamorphic textures and facies.
- Wikipedia: Igneous Rock
- Hyperlinked overview of igneous rock, which is formed when magma cools and solidifies.
- Minerals & Melts
- Software for computational thermodynamics in petrology.
- SOES Geology Collection Igneous Rocks
- Offers a virtual tray of common igneous rock specimens to study.
- Earth Science Lab: Igneous Rock Identification
- Includes igneous rock identification chart, information on texture and composition, and pictorial exercise for identifying the rocks.
- Igneous and Metamorphic Petrology
- Images from the High-Resolution X-ray Computed Tomography Facility at the University of Texas at Austin.
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