Thundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often made ...

What are the easiest gemstones to find in rocks and creeks? Let’s find out here. Gemstones form under conditions of high pressure and temperatures as minerals within the rocks, or form as independent ...

In my last column, I wrote about the locations where you can find igneous rocks that were formed from lava. The metarhyolite and metabasalt described in the column are known as extrusive rocks, those ...

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Zircon crystals in igneous rocks must be carefully examined and not relied upon solely to predict future volcanic eruptions and other tectonic events, researchers have shown. The researchers' findings ...

Ancient, microscopic crystals show a potential link between a series of less well-known mass extinctions and periodic volcanic activity. Some of the most devastating mass extinctions bookended the age ...