By: nova-an-slc
Image: Callan Bentley, Mid-Atlantic Geo-Image Collection
License: Creative Commons Non Commercial ⧉

Uploaded: 8 Jan 2021
Last Updated: 25 Jan 2021

861 megapixels
31,384 x 27,440 pixels
104.6 in X 91.5 in at 300dpi
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Three specimens of obsidian (volcanic glass). Obsidian forms from quick-cooling lavas. Sometimes it is streaked with brown, showing flow structure. Primitive people often used obsidian for knives, arrowheads, and other implements.