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This spiky mystery rock from Alaska is made of glendonite

By Coastal and Marine Hazards and Resources Program 2017 (approx.)
Photo of a spiky brown rock with many dull points in all directions on a white background
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Detailed Description

This spiky mystery rock from Alaska is made of glendonite. Sample collected by Bruce Richmond, Ann Gibbs, and Li Erikson, USGS.

Sources/Usage

Public Domain.