Australian Museum
Australian Museum: Concretions, Thunder Eggs and Geodes
Ever break open a geode and see the beauty inside? Learn how those crystals formed, as well as the mineral formations in thunder eggs and concretions.
Sophia Learning
Sophia: Geology: Geodes: Lesson 1
This lesson will present how to identify and classify geodes. It is 1 of 2 in the series titled "Geology: Geodes."
Science Bob Pflugfelder
Science Bob: Eggshell Geode Crystals
Science Bob provides instructions for how to form geode crystals in eggshells using common supplies with information on why it works.
Indiana University
Indiana University Bloomington: Geo Notes: Geodes: One of Nature's Mysteries
Explains what geodes are, how they form, and where they can be found in Indiana.
Indiana University
Indiana University: Reference Documents: Geodes: One of Nature's Mysteries [Pdf]
A fact card describing the properties and characteristics of geodes, where they can be found, and how they may have formed.
University of Kentucky
University of Kentucky: Rocks and Minerals: Sedimentary Rocks
An excellent resource for learning about sedimentary rocks and how they form. The different types of sedimentary rocks and deposits found in Kentucky are listed, with links to dedicated pages for each. Covers clay, shale, sandstone,...
Curated OER
Science Kids: Science Images: Amethyst Geode
This photo shows the beautiful inside of an amethyst geode which would otherwise look like a normal rock from the outside.
3D Toad
3 dtoad.com: Special Geology
A 3-D view of special geological rocks including Anhydrite, Azurite, Celestite, Fluorite, Kyanite, Opal, and Quartz Geode.
San Diego Natural History Museum
San Diego Natural History Museum: Mineral Matters: Frequently Asked Questions
Frequently asked rock and mineral questions are answered and illustrated.
NC State University
The Engineering Place: Earthquakes and Volcanoes
In this lesson, students simulate volcanic explosions using liquids of varying viscosity, and learn about volcano and earthquake zones around the world.
Sophia Learning
Sophia: Geology: Rock Classification Overview
Understand how to classify rocks and minerals with this concise tutorial.
Curated OER
National Park Service: Agate Fossil Beds: Geologic Formations
This National Park Service site has information about these fossil beds in Nebraska and where the name Agate came from.
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