Today on A Moment of Science, we’ll look at how geodes form and how they collect in such complex patterns.

Geode vs. Agate: What's the Difference? While both geodes and agates are stunning natural formations, they are formed in slightly different ways, which influences their appearance and structure.

Geodes are irresistible. They fill display cases and museums everywhere. I’ve even got one on my desk at home: a smooth, brownish rock encasing milky lavender crystals. It’s hard to deny the allure of ...

The Giant Geode of Pulpi is 25 Feet Long. Now Scientists Know How it Formed Discover the Pulpí geode, a giant cave adorned with spectacular gypsum crystals formed over millions of years in Spain.

On a visit to Tucson, relatives took me to a gem and mineral show where we saw a collection of geodes. Ordinary on the outside; beautiful on the inside. Will you please tell us how they are formed ...

Gabriela Farfan, the Smithsonian's curator of gems and minerals, answers the internet's burning questions about gemstones. Are all minerals crystals? How are diamonds cut? How do geodes form? Is ...

The researchers discovered that the amethyst geodes formed at unexpectedly low crystallisation temperatures of just 15 to 60 °C.

Any geode might make us wonder: What geologic forces form these hollows lined with crystals? But the Pulpí Geode, discovered in an abandoned Spanish mine, takes wonder to a different scale. One ...