A sample of Rapakivi granite, a hornblende-biotite granite containing large rounded crystals of orthoclase each with a rim of oligoclase. Dated 21st Century

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 21st, archival, archive, century, crystal, crystals, geology, granite, historical, history, hornblende-biotite, natural, nature, oligoclase, orthoclase, plagioclase, rapakivi, sample