Iridescent ammonite fossil

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green and red mineral specimen

2569 × 2098

Layered Agate Rock

1280 × 960

Pink Mineral Specimen

1055 × 960

fluorescent mineral under UV light

2048 × 1536

dark mineral fragments

3008 × 2000

Quartz Crystals on Rock

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Red Crystals on Rock

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Clear Quartz Crystals

2016 × 1344

Cluster of Red Crystals — Dramatic

2288 × 1712

Devils Tower National Monument

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Devils Tower National Monument

1920 × 1200