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Lauren Edgar uses a hand lens to identify minerals in a sample from a complex esker.

By Communications and Publishing
A scientist with a dark brown pony tail sits in the middle of rocks and gravel, peering at a rock using a hand lens.
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Lauren Edgar, a research geologist with the USGS Astrogeology Science Center, uses a hand lens to identify minerals in a sample from a complex esker in Iceland. 

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Public Domain.

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