Greenstone (Metamorphosed Basalt), Metamorphic rock, Minnesota
Greenstone (Metamorphosed Basalt), Metamorphic rock, Minnesota
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Photo credit: © Susan E. Degginger / Alamy / Afripics
License: Licensed
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Keywords: basalt, geology, greenstone, isolated, metamorphic, metamorphosed, mineralogy, minnesota, rock, rocks, sample, samples, specimen, specimens