- Experimental Petrology - California Institute of Technology
 - Provides information about the Hawaii Scientific Drilling Project and Experimental Petrology Facilities. - Wikipedia: Rock (Geology)
- Hyperlinked article overview of the study of rocks. Includes definitions of the three main rock types: igneous, sedimentary, and metamorphic.
- GeoMan's Mineral and Rock Charts
- Offers simple charts for the identification of igneous, sedimentary, and metamorphic rocks.
- Rocky the Rock Hound
- Offers hints on rock collection safety, lesson plans, rock identification quizzes, and information on learning how igneous, metamorphic, and sedimentary rocks are formed.
- Athro, Limited: Rock Types
- Provides an overview of the major rock types and how they form.
- Museum of Victoria Mineralogy and Petrology
- Responsible for the geological collections (excluding fossil material) of the State of Victoria.
- Igneous, Sedimentary & Metamorphic Rock Info
- Offers an introduction to intrusive and extrusive volcanic rocks, sedimentary processes, and metamorphic forces.
- Discover How Rocks Are Formed
- Animations that show how the three different kinds of rocks (sedimentary, metamorphic, and igneous) are formed.
- Geochemistry of Rocks of the Oceans and Continents (GEOROC)
- Database serving the international geochemical community with chemical and isotope data of igneous rocks and minerals, together with metadata about samples and analytical procedures.
- This Planet Really Rocks!
- Rock and mineral guide for "junior rockhounds." Contains pages about the origin, classification, recycling processes, and important uses of rocks and minerals.
- British Geological Survey (BGS) Rock Classification Scheme
- Provides classification schemes for igneous, metamorphic, sedimentary, and superficial rock types. Download individual reports or search the database.
- Petrogenesis of Rocks and Minerals, The
- Examines the means by which a rock or mineral deposit is formed. Outlines igneous, metamorphic, and sedimentary process as well as vein environments.
- Petrology at the University of Calgary
- Contributing to the fundamentals of igneous petrology, metamorphic petrology, mineralogy, geochemistry, and the understanding of ore deposits.
- Union College Geology Department Petrology
- Provides both general and regional New England information, photographs, maps, and diagrams about igneous and metamorphic rocks.
- Teaching Petrology in the 21st Century
- Clearinghouse for a variety of educational and supporting materials for teaching igneous and metamorphic petrology.
- Visions of Earth
- National Geographic feature about the work of Bill Atkinson, capturing the beauty of intense close-ups of rock cross-sections.
- Thermobarometry
- Programme calculates pressures and temperatures for garnet - cordierite - spinel - sillimanite/kyanite - quartz anhydrous or hydrous pelitic assemblages.
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