Day in Review: NASA, USGS Scientists Go Rock Hounding in California’s High Desert

The discovery of topaz on a volcanic outcrop in the Mojave Desert may hint at a porphyry copper deposit below. 

Missions __ News __ Galleries __ Events June 11, 2026 Earth NASA, USGS Scientists Go Rock Hounding in California’s High Desert The discovery of topaz on a volcanic outcrop in the Mojave Desert may hint at a porphyry copper deposit below. Full Story and Images

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