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File:Dacite-ThinSection-USGS.jpg

Dacite-ThinSection-USGS.jpg ‎(600 × 480 pixels, file size: 102 KB, MIME type: image/jpeg)

Summary

Thin section image in crossed polars of a Dacite sample from a dome in Mount St. Helens. Image by United States Geological Survey, a federal scientific agency.

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