Rocks & Minerals 

• Amethyst Galleries' Mineral Gallery
  "Amethyst Galleries' Mineral Gallery is a large collection of mineral descriptions, images, and specimens ... together with several ways of accessing these descriptions."
• Athena Mineralogy
  "Here are mineral lists (IMA approved mineral names and varieties names) sorted either alphabetically or arranged systematically." Quite extensive.
• Interactives: The Rock Cycle
  "Site where students can learn all about rocks and geology, the science of rocks. They will learn how rocks can be identified, how they are formed, and how they change over time."
• Mineralogy Database
  Tons of information about mineralogy and specific minerals.
• The Nature of Diamonds
  Online exhibit from the American Museum of Natural History.

 Geology and Earth History 

• Essentials of Geology
  Although designed to accompany a specific textbook, this site has animations, definitions, news, and other materials useful to anyone interested in the subject.
• Geology Labs Online
  Learn about earthquakes, geologic dating, and rivers through these online labs.
• Geology of the Parks
  The geology and geologic history of the U.S. National Parks.
• Illustrated Glossary of Geologic Terms
  Handy glossary with some clickable links to images.
• NASA: Earth   /   NASA: Earth Observatory
  Tons of information and resources about the Earth as a planet.
• National Geophysical Data Center
  Information includes Earth observations from space, natural hazards, solar weather and events, marine geology, geomagnetic data, and more.
• Paleomap Project
  "The goal of the PALEOMAP Project is to illustrate the plate tectonic development of the ocean basins and continents, as well as the changing distribution of land and sea during the past 1100 million years."
• Regional Paleogeographic Views of Earth History
  "This presentation uses a series of paleogeographic and plate-tectonic reconstructions to show the broad patterns of Phanerozoic Earth history. Organization is by region and in geologic order from oldest to youngest for each region."
• Tour of Geologic Time
  "Here you can journey through the history of the Earth, with stops at particular points in time to examine the fossil record and stratigraphy."
• USGS: United States Geological Survey
  Lots of information about geology, especially in the U.S. Two good places to start are the FAQ page and the Library.
• Web Geological Time Machine
  Information about the history of the planet by geologic era.

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