thunderegg from buchanan, oregon

U.S. State Rocks, Minerals & Gemstones

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Theodore Roosevelt National Park, shown here as landscape with a road running through it, is part of the history of U.S. presidents and geology.

Presidents and Geology

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The main road in White Sands National Park.

White Sands National Park Geology

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rocky Lake Michigan beach at sunset

8 Rocks Found on Lake Michigan Beaches

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yooperlites fluorescing under UV light

Yooperlites: What & Where to Find Them

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heart-shaped citrine quartz gemstone

Citrine Quartz Field Guide

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kingston-starburst-quartz-crystals

Finding Starburst Quartz, New Mexico

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inclusions-in-quartz

9 Types of Inclusions in Quartz

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quartz mineral identification

How to Identify Quartz Crystals

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Cave pearls in the Cave of the Mounds.

Cave Pearls: Nature’s Hidden Gems

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