This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Guilford Quartz Monzonite closeup. Guilford Quartz Monzonite of Ordovician or Silurian age Photographed on boulder at the old Guilford Quarry on Guilford Road Columbia Maryland took myselfbr Previously published none Jstuby Cczero Original upload log en GuilfordQuartzMonzonitecloseup bytes Jstuby Uploading selfmade file